Tankless Water Heater issue

[Ajax1000]

I have a 2019Thor Vegas with a tankless water heater. There is NO consistence in water temp. Very hot to no heat. Is there a trick to steady warm water?

[Sugarshore]

Seems the tankless (Girard?) pose a challenge maintaining constant temps. Several strategies may be to set an adjustable water pressure gauge at about 53 (suggested in earlier posts), the water temp at about 105, use only the hot water faucets, and the Thor rep at last weekend’s rally told us that running the pump even while on ‘city’ water helps. Hope someone else weighs in to offer corrections.

[taylorbob1]

For showers: set to 109 degrees, Use hot only
For kitchen/bath single handle faucet: 125 degrees

Remember, when you turn off water at faucet, even for a moment...the hot water system turns off. Then when you turn water at faucet on again, it takes time for new water entering the hot water system to heat up and travel all the way to the faucet. Granted, there is still hot/warmth within the line, but once that runs thru, you get cold for a moment until the “new hot” water travels to you.

And if you place your single handle faucet “in the middle”, the hot water system will ignite and use propane but it may take a gallon or more before you feel warmth.

So, its best to either run “all hot” or “no hot” if your goal is to use as little propane as possible.

[Judge]

If it is the Girard tankless on demand heater.....

You also need 50 PSI of water pressure for optimal performance. I use a pressure regulator set to 45 - 50 PSI.

Then set your desired temp and only use the hot water tap. Works like a charm!

[Bob Denman]

I agree: 50 psi starts to make the magic happen.