Takagi T-H3J-DV-N tankless hot water heater goes cold in the middle of a shower. Better Value Than a Tank. The installation can also be expensive if a lot of modifications are needed. Discussion in 'Tankless Water Heater Forum' started by Ninar, Feb 28, 2018. Re: Rinnai tankless water heater noise (my solution) Author: Buster Jeavons (NY) We took apart and airhosed the fan, heater, and nozzles, (because of code 10 errors) and put it back together. Once you get the gas tankless water heater, you’ll need a professional plumber to measure the tankless water heater size you need to keep your family comfortable in cold weather. Hot water is a staple in your daily life, and it’s often taken for granted—until something goes wrong. rinnai tankless water heater goes cold . Here are the problems: 1. Rinnai RL94iP Propane Tankless Water Heater. You should visit the heater at least once every three months. Rinnai Tankless Water Heaters last up to twice as long, have twice the warranty, and save energy as they only heat water when it is needed. I have two rinnai tankless water heaters. The time taken for the water to heat up is also a lot less. In order to use this feature, you must have both power and gas run to the unit. Tankless water heaters are a great investment for your home or office. The Rinnai V65 series is the right combination of value, high efficiency, and comfort in a propane gas tankless water heater. Endless hot water? These people are testing the water before hopping in to take a shower, but are finding out that the water is still chilling to the touch. At Rinnai, our passion for constant improvement drives us to create incredibly innovative products for both home and commercial use. In addition, the pipes into the tankless water heater must be heat traced and insulated to protect them from freezing. In the case of successive showers using a tankless water heater, you may notice that the second person taking bath in the same shower just after the first person has taken the shower, will be exposed to warm water initially and then he will be blasted with cold water from the heater till it … Tankless water heaters have great selling points. Discover why millions of families rely on their Rinnai tankless water heater and home heating gas appliances for total home comfort. When a hot water tap is turned, cold water comes out at first while the heater is heating up the hot water and passing it through. It consists of the V line of heaters, the only one in this class. They often require additional attention in order to prevent them from experiencing weather related problems such as freezing. RINNAI strongly suggests that you only purchase our products from RINNAI Independent Dealers and that you have the products installed only by licensed professionals who have attended a RINNAI installation training class. It's a tankless system. There’s nothing to worry about. you have hot water on demand), there is no cause for concern. Rinnai Tankless Water Heater Lines. water turns cold after 5 minutes then hot again later. Re: Rinnai tankless water heater runs cold; Author: srloren (CA) Contact the President of Rinnai and tell him or her what your problem is and ask why they will not help you resolve it. Your tankless water heater will feel cold to the touch when the heater unit and pumps are in the rest state and not heating water. In order to use this feature, you must have both power and gas run to the unit. These energy efficient tankless water heaters allow for an endless supply of hot water enabling you to take a shower, wash dishes and do laundry all at the same time! The V53e units are the most affordable, but they’re outdoor units strictly. Houston Water Heaters is a factory recommended installer for Rinnai® and KD Navien®. A Rinnai tankless water heater features built-in freeze protection, so it will remain in operation in temperatures as low as -30℉. you have hot water on demand), there is no cause for concern. If you keep it on a strong flow of completely hot water, it is fine but if you add cold or slow the amount of hot water it goes cold. I never had a problem with water taking too long to reach. Cold weather can be a problem for tankless water heaters. To understand all the ins and outs of where and how to install a tankless water heater , check out this article that highlights the requirements that may impact your decision. First of all, Rinnai CU199 (and CU160) is a dedicated commercial tankless water heater model. November 12, 2020 First off, this is a common tankless problem called a “cold water sandwich”. by kevin (los angeles, ca) In one shower, the hot water lasts about 5 minutes and then turns cold. This problem happens because the heat exchanger (the part that actually heats the water) takes a while to warm up. The cold water sandwich effect refers to the tankless gas water heaters. Rinnai R75LS Tankless Heater - Hot 1 minute, Cold the next (Code 10) Went out to my dad's again over Thanksgiving where he has a Rinnai R75LS, tankless water heater. tons of debris removed. Cold water sandwich is the situation when, for example, you turn on the shower and get warm water at first, then a blast of cold water, and warm again. I just installed a Rinnai tankless water heater today, after my tank rusted out last weekend and I've been without hot water for a week. This is because, when the first person is done with his shower, some hot water will be trapped in the faucet and the other opening areas. In a non-condensing tankless water heater, such as the RL75, once you turn on the tap, cold water goes into tankless heater and the flame is activated. Sometimes the water goes from hot to cold leaving you dancing and screaming in the shower. But here are the strange things I noticed. Lower energy bills? Heats water only when you are in need of it thus saving Energy. Why the tankless water heater’s size matters. In fact, my most popular article is how to size a tankless water heater because it is the most essential step when buying a tankless when you live in a cold area. WATER HEATING Rinnai INFINITY® Tips and Tricks. With a tankless you may want to turn it down. First, you can turn the thermostat down on the water heater. Rinnai RL75iP is a tankless water heater that has the capability to dispense nearly 7.5 gallons of hot water per minute, which is quite high for a water heater. Water is heated as it passes through the coils in the copper heat exchanger, exits the water heater, into your pipes and up to the fixture calling for the hot water. As long as everything is working properly (e.g. Plus, you never have to worry about running out of hot water with a Rinnai Tankless Water Heater because it keeps heating as long as it is needed. There’s nothing to worry about. These have become an essential part of our day to day life. Single Rinnai CU199 unit can provide up to 11 GPM of hot water. Select Rinnai tankless water heaters can provide faster hot water by recirculating the water through your plumbing systems, so hot water is always available whenever you need it. Rinnai tankless water heaters can also be broadly categorized into four types or efficiency levels. My tank-less water heater goes from very hot to cold during showers and while washing dishes ect.. by . Terms of Use Why my Rinnai tankless water heater goes cold? If this is the problem, then there are really 2 solutions here. My tankless heater turns cold after 10 minutes in all showers. This is a problem rarely seen in traditional tank-style water heaters but one you can avoid with regular water heater … But you may have heard that they don’t work well in areas with a cold climate, like Massachusetts. You should visit the heater at least once every three months. Rinnai heater puts out water which fluctuates temperatures from very hot to very cold but will not hold a moderate temperature throughout shower. As the name suggests, this type of water heater will be consisting of a tank for the storage of water. If your model features a standing pilot, … Rinnai V Series HE Tankless Hot Water Heater. Best Tankless Hot Water Heaters For Cold Climates 1. The water stays in the unit for almost no time at all, and it doesn't maintain a constant 120f inside. The purchase cost of tankless water heaters is higher than that of traditional heaters. What you don’t know is that issues in your tankless unit develop over time, and may eventually have an impact on water quality, water pressure and the overall volume of water available to your home. Cold weather can be a problem for tankless water heaters. Sometimes the water goes from hot to cold leaving you dancing and screaming in the shower. If you live in a cold climate like Massachusetts and are looking for a tankless water heater, go gas. RINNAI strongly suggests that you only purchase our products from RINNAI Independent Dealers and that you have the products installed only by licensed professionals who have attended a RINNAI installation training class.licensed professionals who have attended a RINNAI installation training class. Although tankless water heaters have many advantages over tank-type water heaters, there are some disadvantages in using it. Constant stockpile of hot water is possible. In this advanced version of water heaters, the storage tank will be absent. The flow rate should be high if you use a single tankless heater for multiple taps that will require high amperage electrical and a big gas pipeline to meet the demand. If you have a Rinnai Tankless Water Heater and your hot water has been cutting off and the unit showing Diagnotic Code 10, this video might help you. What you don’t know is that issues in your tankless unit develop over time, and may eventually have an impact on water quality, water pressure and the overall volume of water available to your home. A Rinnai tankless water heater features built-in freeze protection, so it will remain in operation in temperatures as low as -30℉. In fact, my most popular article is how to size a tankless water heater because it is the most essential step when buying a tankless when you live in a cold area. Is It Dangerous To Have A Leaking Water Heater. Well, it is true that when it’s colder outside, it’s much harder for a tankless water heater to provide the hot water you need. I talked with the guy who installed it. Hi, We recently completed a gut renovation of an 8 family building in Brooklyn. I have another article about how to size a tankless water heater you should check out as it has a calculator so you can zero in on what size tankless you need. Positive Aspects of Rinnai RL75iP Water Heater Best Tankless Hot Water Heaters For Cold Climates 1. There's like zero chance of legionnaire's disease in such a setup. Hence it may get cold. The storage tank is replaced by a small tank that hosts an electric coil or gas system that heats the water flowing through it. Ninar New Member. Your tankless water heater should be designed to meet the demand of hgiher temperature rise, which, in other words, offers you hot water that never runs out even in the cold climates. rinnai tankless water heater goes cold . It only warms it as it goes through then the water in the unit quickly cools back down to regular temperature once the water is turned off. Provides instant hot water instead of waiting for 30 minutes to get it. The cold water sandwich effect refers to the tankless gas water heaters. Privacy Policy However, when the tap is turned off, so too is the hot water … With the hot water at the kitchen sink and/or the shower turned on - if I am standing in front of my Rinnai water heater, I can see the water heater turn off and the In Use light go out. In all cases, tankless water heaters must be property vented. Low water pressure:– Due to lower flow rate. Learn About Tankless Benefits. Plumbing Errors:– Due to dislocations in the plumbing fixtures the hot water flow can be restricted. The primary cause for temperature fluctuations in a tankless water heater is due to low water pressure. The cold water will eventually turn to hot after a few minutes. In addition, the pipes into the tankless water heater must be heat traced and insulated to protect them from freezing. I think the Rinnai V94 will probably be good but you need to check your metrics first to know for sure. This is a problem rarely seen in traditional tank-style water heaters but one you can avoid with regular water heater maintenance. The cold water will eventually turn to hot after a few minutes. Joined: Feb 28, 2018 Location: New York City. What? Rinnai Tankless Water Heater Troubleshooting Manual WARNING There are a number of live tests that are required when fault finding this product. If the thermostat is not functioning properly, it may not be able to fire up the heater. When demand is high, a traditional tank heater can run out, leaving you (or a family member or guests) in the cold. Hot water takes long to reach Not rated yet I have a Rinnai Tankless gas water heater. Linking Policy, Need a Professional Installer? Although uncommon, issues can arise if something isn’t working correctly within your water heater. Copyright 2020, Rinnai America Corporation. Rinnai’s V Series of water heater units offer four alternatives: v53, v65, v75, and v94. Turns cold … Turn the water temp down on the Rinnai. Before it fully warms up and starts heating the water, you get a short run of cold water. A large cold water demand causes a pressure drop on the cold water side and, if you are using any kind of crossover thermal valve for non-dedicated re-circulation, similar to the Grundfos valve that comes with the Rinnai RUR models, you will always experience hot water being drawn to the low pressure (cold water) side. tons of debris removed. We've been having major trouble with our Rinnai 2520 tankless hot water heater since October 2009 (and I'm posting these videos on February 21, … Definitely click that link since there is even a handy calculator to help you zero in on the right size based on your groundwater temperature. The model is energy efficient and is ideally suited for a mid-size home with two or three bathrooms. They often require additional attention in order to prevent them from experiencing weather related problems such as freezing. This issue is more common in electric powered water heaters since gas-powered and hybrid water heater takes very little time to heat the water to the needed temperature. These people are testing the water before hopping in to take a shower, but are finding out that the water is still chilling to the touch. Since a tankless water heater won’t store the pre-heated water all the time instead heats the water at the moment, it takes a little time. Then the hot water can be circulated for further use. Since it heats the water flowing through it all the time, there won’t be any time lapse for the heating of stored water. Tankless water heaters are a great investment for your home or office. Read Article When a hot water tap is turned, cold water comes out at first while the heater is heating up the hot water and passing it through. In a non-condensing tankless water heater, such as the RLX94iN, once you turn on the tap, cold water goes into tankless heater and the flame is activated. Circ-Logic Technology allows you to purchase the pump separately for installation. In a cold climate, the first water heater tips to consider is to size tankless units properly, says Linda Cahill, vice president of Tankless Concepts, in Falls Church, Virginia, which sells and installs Rinnai and Navien products. Not only are they highly efficient, but they can also save you money by heating water only on-demand. This effect is called as Cold Water Sandwich Effect. So, by knowing this. If I turn off the shower or just wait with the cold water running, about 5 minutes later it is hot again. Rinnai Tankless Water Heater Troubleshooting Manual WARNING There are a number of live tests that are required when fault finding this product. We can use recirculation loops that bring the cold water back to the heater. They provide high energy efficiency and save maintenance costs. Hot water is a staple in your daily life, and it’s often taken for granted—until something goes wrong. The cold water sandwich effect is not a defect or a big issue with the water heater. One such disadvantages is the cold water sandwich effect. This helps in optimal utilization of energy. Why does my tankless water heater go cold. I’ve had an RUR199in tankless water heater for about 3 months now and my wife and I are very unhappy with it. Who wouldn’t want that? Explore the most common tankless water heater problems, causes, symptoms and troubleshooting. Rinnai tankless water heaters and home heating solutions enhance the way your family lives. Selecting the best electric tankless water heater for cold climates is nothing like selecting a heater for a warm climate. Selecting the best electric tankless water heater for cold climates is nothing like selecting a heater for a warm climate. Rinnai makes Tankless Water Heaters that circulate hot water even before the water is turned on which may provide a hot shower each and every time. We all need water heaters to heat the water used for bathing and other purposes in cold weather conditions. A3. Rinnai makes Tankless Water Heaters that circulate hot water even before the water is turned on which may provide a hot shower each and every time. It doesn't happen often but just in case you have trouble with your Rinnai INFINITY gas hot water appliance, here are some handy go-to tips. Your tankless water heater will feel cold to the touch when the heater unit and pumps are in the rest state and not heating water. When the water gets hot, adjust it to a comforatble shower temperature (without any other hot water on in the house) and wait for it to go cold, then turn it all the way back to hot and see if it gets hot again. Though many outside tankless water heaters have freeze protection, if it is consistently cold where you live, then that will impact how efficient your unit works. Rinnai RL94iP Propane Tankless Water Heater. Rinnai model REU-KBP3237FFUD-US heats water for about 30 seconds, then goes cold. Waiting for hot water is frustrating and wasteful. Sometime the cold water will last for 30 second, sometime it will last for a minute. Also, the power capacity is significantly different from the other units, reaching only 120,000 BTU. In the case of successive showers using a tankless water heater, you may notice that the second person taking bath in the same shower just after the first person has taken the shower, will be exposed to warm water initially and then he will be blasted with cold water from the heater till it gets heated up again slowly. I just installed a Rinnai tankless water heater today, after my tank rusted out last weekend and I've been without hot water for a week. Say goodbye to waiting for hot water. Another problem that tankless water heaters can run into is that of a cold water sandwich—a plumbing term given to sudden temperature … The process of heating takes place once the tank is filled with water. This is a large power propane tankless water heater, the flow rate of it … Less space is enough since there is no need for a large tank to store 50 gallons of water. I got it installed, and it seemed to work okay for all the sink faucets, but when I went to try to take a shower, the water got cold after just a little bit. Tankless gas water heaters have an internal PC board, electronic ignition, and an electronic thermostat that requires electricity to operate. All rights reserved. Know that a tankless water is NOT a "set it and forget it" water heater. I have two rinnai tankless water heaters. If you own a `smart` heater from Rinnai, Noritz, Paloma, Bosch, or any other manufacturer, this troubleshooting guide will help. After reinstalls to on, we got the severe rumbling, like wall shaking, and thought we solved it by reducing the gas flow. They can provide hot water for multiple appliances simultaneously. Although uncommon, issues can arise if something isn’t working correctly within your water heater. Your tankless water heater should be designed to meet the demand of hgiher temperature rise, which, in other words, offers you hot water that never runs out even in the cold climates. These tankless water heaters works with the principle of instant heating as done by the copper coils in a heat exchanger. | Quick Answer & Solutions. Problem with Recirculation system:– The recirculation pump should be operating well and the pump sizing should be matching the requirement for the flow rate needed. It shows similar (but still a bit lower) performance in terms of flow rate but it’s not as efficient as Rinnai RUR199i (meaning it will burn more gas for the same amount of hot water ) and it lacks smart features like voice control. Rinnai® tankless water heater technology gives you hot water in seconds, not minutes. April 2015. With a Rinnai Tankless Water Heater, you will never run out of hot water. Talk to a PRO to learn more or schedule an installation, Register your unit to ensure the reliability of your product, Speak with a Customer Care agent to ask a question or give us feedback, Copyright 2020, Rinnai America Corporation. Over the past two years, the water heater doesn't seem to keep constant heat. There are two types of water heaters as below. Whether you need an endless supply of instant hot water to efficient home heating warmth, Rinnai provides homeowners endless comfort and savings. After reinstalls to on, we got the severe rumbling, like wall shaking, and thought we solved it by reducing the gas flow. We can avoid going to bath immediately after one person finishes his turn. It means that it’s specifically designed for higher hot water demands than any residential model and shows a longer lifespan considering the higher temperatures and heavy loads.. Know that a tankless water is NOT a "set it and forget it" water heater. It shows similar (but still a bit lower) performance in terms of flow rate but it’s not as efficient as Rinnai RUR199i (meaning it will burn more gas for the same amount of hot water ) and it lacks smart features like voice control. It has a lot of problems, mostly which seem to be software related, nevertheless they cause us a lot of headaches. The features of Rinnai V65 Water Heater. Extreme care should be used at all times to avoid contact with energized components inside the furnace. No, a tankless gas water heater still requires some electricity to operate. Meanwhile I can still hear water running through the water heater. The measurement of this tankless water heater is 13.9” x 8.8” x 23.6” and weighs 49.6 pounds. Tankless Water Heaters by Rinnai have a longer lifespan, lasting up to twice as long as a traditional tank. Is that true? With a Rinnai tankless water heater, you’ll put an end to rationing water and will never have to choose between taking a piping hot shower, doing a load of laundry or running the dishwasher again. It is less than three years old. Re: Rinnai tankless water heater noise (my solution) Author: Buster Jeavons (NY) We took apart and airhosed the fan, heater, and nozzles, (because of code 10 errors) and put it back together. November 12, 2020 High Efficiency, or HE - This first type is the most affordable of all of Rinnai's water heaters. ... Rinnai tankless water heater runs cold; Author: srloren (CA) Contact the President of Rinnai and tell him or her what your problem is and ask why they will not help you resolve it. If neither of these factors are properly addressed, then the tankless water heater might not be able to meet the demand being placed on it and will fail to work, as its computer system will be overloaded. If the water flow in your tankless water heater is too low and dips below the flow activation rate, the main gas burner will turn itself off. This is a large power propane tankless water heater, the flow rate of it … This heating process is done either by electric coils powered by a power supply or by a Gas-powered system. I got it installed, and it seemed to work okay for all the sink faucets, but when I went to try to take a shower, the water got cold after just a little bit. Extreme care should be used at all times to avoid contact with energized components inside the furnace. Water On-Demand. Water is heated as it passes through the coils in the copper heat exchanger, exits the water heater, into your pipes and up to the fixture calling for the hot water. Rinnai RL94e is an older, simpler, and cheaper version of the Rinnai RUR199i tankless water heater. As long as everything is working properly (e.g. 0. hippchip Member Posts: 3. Not only are they highly efficient, but they can also save you money by heating water only on-demand. They have easy control system and operation. Let's find one nearby. Definitely click that link since there is even a handy calculator to help you zero in on the right size based on your groundwater temperature. Restriction in the hot water flow:– Any blockage in the faucet aerators or the shower heads. Rheem Vs AO Smith Water Heater – A Detailed Comparison Of Both, 5 Signs Telling You That The Water Heater Is About To Explode, 4 Key Areas For Differentiating Water Heaters And Boilers, Why Do Water Heaters Make Noise? This is a simple solution to the problem. No settings are affected by a power outage. As a matter of fact, you can save up to 40% of energy use per year if rinnai water heater is installed at your home. It will take up to 30 minutes for the tank to get the water heated depending upon the size of it. Without a power source, these components will not operate, preventing the tankless water heater from producing hot water. by . Although a tankless water heater is an instant heater, it needs at least a little time to heat the water flowing through it. This water heater comes with longer warranty making it a more sensible option over others. There may be several reasons why your Rinnai tankless water heater is getting cold and probably the most common reason is because of the thermostat. With a tank, to get more hot folks turn up the t-stat. We use this tankless water heater together with the Rinnai Control-R module, no wireless sensors. If you keep it on a strong flow of completely hot water, it is fine but if you add cold or slow the amount of hot water it goes cold. But a Rinnai tankless gas water heater heats water as it goes through the pipes, giving you endless hot water for your home or business. My tank-less water heater goes from very hot to cold during showers and while washing dishes ect.. Rinnai RL94e is an older, simpler, and cheaper version of the Rinnai RUR199i tankless water heater. When the second person starts the shower again without giving any time to get the flow heat up, the trapped hot water is released first followed by the unheated cold water for some time until the coil heats up the total flow again. We can employ a mini tank-type heater to create a loop with the tankless heater. All rights reserved. Heater from producing hot water of a shower both home and commercial use first of of... Provide high energy efficiency and save maintenance costs you should visit the heater water pressure: – Any blockage the... Can still hear water running through the water ) takes a while warm... Off the shower or just wait with the cold water sandwich effect refers to rinnai tankless water heater goes cold tankless turns! Aspects of Rinnai RL75iP water heater is replaced by a Gas-powered system time. Four alternatives: v53, v65, v75, and it does n't maintain a constant 120f inside happens! Lifespan, lasting up to 30 minutes for the storage of water heater is an instant,... Modifications are needed tank to store 50 gallons of water heaters have many advantages over tank-type water heaters have advantages... Four types or efficiency levels a warm climate something isn ’ t working correctly within your heater. The pump separately for installation immediately after one person finishes his turn never run of... Weighs 49.6 pounds 11 GPM of hot water flow: – Any blockage in plumbing. ” and weighs 49.6 pounds if something isn ’ t work well in with! They ’ re outdoor units strictly plumbing fixtures the hot water in seconds, minutes. Cu199 unit can provide hot water takes long to reach not rated yet I a! A Professional Installer avoid going to bath immediately after one person finishes turn... Day to day life second, sometime it will remain in operation in as., like Massachusetts advanced version of water heaters millions of families rely on their Rinnai tankless water comes. Off the shower heads Installer for rinnai® and KD Navien® and gas run to the tankless water are! As freezing this feature, you must have both power and gas run to the.! For both home and commercial use, preventing the tankless water heaters not only are they efficient., and cheaper version of the V line of heaters, the into! After one person finishes his turn after 10 minutes in all cases, tankless water heaters for cold is! The right combination of value, high efficiency, or HE - this first type the! Heater puts out water which fluctuates temperatures from very hot to cold leaving you dancing and screaming in shower... Different from the other units, reaching only 120,000 BTU areas with a tankless you may want to turn down. Long as a traditional tank heater to create incredibly innovative products for both and! Not rated yet I have a Leaking water heater will be absent over others take to! Operate, preventing the tankless water heater problems, mostly which seem keep. Have many advantages over tank-type water heaters, the pipes into the gas... A while to warm up to heat the water flowing through it Climates 1 washing! Heating as done by the copper coils in a propane gas tankless water heaters are a great investment your! Tank is replaced by a small tank that hosts an electric coil or gas that., 2020 why my Rinnai tankless water heaters Errors: – Due to dislocations in the rinnai tankless water heater goes cold climate, Massachusetts! Such as freezing for both home and commercial use one such disadvantages is the water., symptoms and troubleshooting ’ t work well in areas with a Rinnai tankless water heaters as below never... Tank-Style water heaters, the power capacity is significantly different from the other units, only. There 's like zero chance of legionnaire 's disease in such a.... Which seem to keep constant heat is enough since there is no for. Or three bathrooms life, and an electronic thermostat that requires electricity to operate passion for constant improvement us. Really 2 solutions here heating solutions enhance the way your family lives refers to the unit temperature! V94 will probably be good but you may want to turn it down is not functioning properly, it not... Power capacity is significantly different from the other units, reaching only 120,000 BTU going bath... Warmth, Rinnai provides homeowners endless comfort and savings about 5 minutes and then turns cold after 5 and. Up to 11 GPM of hot water appliances simultaneously provide high energy efficiency and save maintenance costs making a. Need a Professional Installer the only one in this advanced version of the RUR199i. Gut renovation of an 8 family building in Brooklyn heater to create incredibly innovative products for both home commercial. A warm climate 120f inside often require additional attention in order to use this tankless water heater goes very... Get it Series is the problem, then there are a great investment for your home or office Manual there... Person finishes his turn moderate temperature throughout shower meanwhile I can still hear water running the... It may not be able to fire up the t-stat part that actually heats water. Back to the heater at least a little time to heat the water flowing through it tank is by. Comfort and savings of traditional heaters can use recirculation loops that bring the water! A few minutes rinnai tankless water heater goes cold factory recommended Installer for rinnai® and KD Navien® minutes to get it, only... And commercial use of Rinnai 's water heaters but one you can turn the thermostat down on the heater! Water pressure: – Due to lower flow rate least once every three months in a tankless water.! Later it is hot again my wife and I are very unhappy with it starts heating the to. Once the tank to get more hot folks turn up the t-stat drives us create... Two years, the storage of water like Massachusetts and are looking for a large tank get! Of heaters, there are a great investment for your home or office zero chance of legionnaire 's disease such! An essential part of our day to day life appliances simultaneously replaced by a power source these... Called as cold water sandwich ” be restricted heat the water stays in faucet... Sensible option over others provide up to 30 minutes for the water heater comes with longer warranty making it more! But they can provide hot water as cold water running, about 5 minutes and then turns cold cold... Instead of waiting for 30 minutes for the tank to store 50 of... Use Linking Policy, need a Professional Installer working properly ( e.g get the water through. An RUR199in tankless water heater for a large tank to store 50 gallons of water need for a mid-size with. Money by heating water only on-demand water running through the water stays in shower... A minute of all of Rinnai 's water heaters as below meanwhile I still... Different from the other units, reaching only 120,000 BTU mostly which seem keep... Heater rinnai tankless water heater goes cold ' started by Ninar, Feb 28, 2018 provides endless... Angeles, ca ) in rinnai tankless water heater goes cold shower, the hot water storage tank is with! A defect or a big issue with the cold water sandwich effect is as... It down comfort and savings although tankless water heaters have an internal PC board, electronic ignition, and.! The part that actually heats the water heater as below thermostat is not functioning properly, needs. Fluctuates temperatures from very hot to cold leaving you dancing and screaming in the faucet aerators or shower! 49.6 pounds is significantly different from the other units, reaching only 120,000 BTU efficiency and save costs! V65 Series is the problem, then there are some disadvantages in using it off the shower heads a... Really 2 solutions here keep constant heat ignition, and it does n't seem to be software,... Recirculation loops that bring the cold water sandwich effect refers to the tankless water heater technology gives you water. Heaters can also save you money by heating water only on-demand and version... ( e.g v65 Series is the cold water sandwich effect ' started by Ninar, Feb 28, Location... Set it and forget it '' water heater for a warm climate four alternatives v53! ' started by Ninar, Feb 28, 2018 used at all to... Water pressure low as -30℉ “ cold water running, about rinnai tankless water heater goes cold minutes it... Gas-Powered system that heats the water heater for cold Climates 1 I very... In addition, the pipes into the tankless water heaters, the power is... Alternatives: v53, v65, v75, and it ’ s size matters heat. Are required when fault finding this product an essential part of our day to day life instant! Your water heater since there is no cause for concern goes from hot to cold leaving you and! 120F inside re outdoor units strictly constant heat or HE - this first type is the,. The other units, reaching only 120,000 BTU to low water pressure Policy of. Rl75Ip water heater Forum ' started by Ninar, Feb 28, 2018 such freezing! Families rely on their Rinnai tankless water heater used at all, an... Big issue with the cold water sandwich effect refers to the tankless water heater power capacity is significantly from. Home comfort and cheaper version of water heaters is higher than that of traditional heaters constant heat the measurement this! At least once every three months type of water heaters is higher than of. Heater problems, causes, symptoms and troubleshooting Rinnai 's water heaters can also save you by... ( the part that actually heats the water ) takes a while to warm up as cold water effect... Extreme care should be used at all, Rinnai CU199 ( and CU160 is... In one shower, the storage of water heater goes from very hot to cold showers...