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Old 04-15-2019, 02:34 AM   #1
Junior Member
Brand: Thor Motor Coach
Model: Vegas 27.7
State: Georgia
Posts: 24
THOR #14579
Tankless Water Heater issue

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?

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Old 04-15-2019, 03:05 AM   #2
Junior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Florida
Posts: 19
THOR #10707
Tankless water heater

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.

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Old 04-15-2019, 09:29 AM   #3
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Brand: Thor Motor Coach
Model: '17-Vegas 24.1
State: California
Posts: 626
THOR #13362
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.
'17 Vegas 24.1
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Old 04-15-2019, 09:39 AM   #4
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Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 613
THOR #12751
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!
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Old 04-15-2019, 11:16 AM   #5
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Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 12,848
THOR #8860
I agree: 50 psi starts to make the magic happen.
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shower, water heater shower

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