Question about Rinnai Desa Vent-Free Infrared Gas Heater: Vent-Free Infrared Gas Heater(18,000 BTU)

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My rinnai water heater keeps cutting off while having a shower. does anyone have this problem, please respond

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Sounds like a bad flow switch.

Posted on Nov 15, 2009

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Posted on Jan 02, 2017

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We have a problem with our Rinnai 24 hot water service. Hot water goes hot and cold. Does not keep to 38 degrees temperature when showering.


Do You know if there is an anti scald valve in the shower valve? If so it may be scald up with corrosion and need replaced! To see if this could be the problem, flush the toilet next to the shower while the shower is running. If temperature changes in shower I would say that is your problem! If You need to replace it, it would be cheaper to do it yourself! They should be videos on Youtube on how to do it! Good Luck! Regards!

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A fault often found with these units is due to insufficient water flow. Usually this causes specifically the shower to run hot and cold. Try turning on more than one hot supply; if this fixxes the fault you will need to try and increase water flow. Most new tapware/showerware have water flow restictors built in. These are the cause of many problems with continous flow heaters such as the Rinnai. In taps they are usually located in the spout if it unscrews. In showers try the shower hose. Find them and take them out. Also make sure your mains supply to the house is on full.
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I have to turn on lavatory faucet at the same time I'm running the shower so when I taking a shower the water doesnt go from hot to cold. It seams that maybe the hot water demad that the shower requires is...


This is not an uncommon problem with 'flash heaters' of this type; for safety, they all require a certain minimum of flow before the gas supply is turned on. Some brands/models have a factory-set adjustment for the minimum flow rate.
You might locate the mfr.'s website, contact them and describe your problem. This can also be caused by the modern flow-limited shower heads not allowing enough water to flow to keep the heater turned on.
If you have a retired shower head, you might try replacing the one currently used to see if it allows enough flow to allow proper operation. Either way, it is a waste of water.

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Try National Energy they are on line they sell spares they may be able to help .

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you can get it off the rinnai web site they have a spot on there to get the internet manuel,, but from what you are saying you may need to adjust the thermostat, or the temp, remember even though you will have endless hot water it still takes the smae amount of timed for the hot water to get to your faucet,, not only that make sure your shower heads aren't holding back to much water pressure, if you don't have enough water going thru the unit it will not stay lit, if will come on and go off, judt to dstisfy the unit,, make sure the filter is clear, on the cold side there is a cap screw if you take it off there is a screen in side you just pull it out and clean it and reinstal it,,

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Question, is there any other equipment that uses propane? You indicate that the problem started after a delivery of propane after running out. If so, I suspect a blockage in either the gas train or the rinnai itself. If tou have the temperature control that regulates the water temperature, you can recall error codes to pinpoint the issue. They are optional equipment so if you can wire one in or ask your propane gas supplier if their service department has one, it will aide in the diagnosis.

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