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Old 01-04-2021, 02:09 PM   #1
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Hot water runs out quick!

I have a HydroHot system and my hot water is running out way too quick. Any suggestions on where to look first? Thanks!
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Old 01-04-2021, 02:33 PM   #2
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Are you running the diesel burner or just electric?
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Old 01-04-2021, 02:38 PM   #3
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Longshot but worth checking..
Outdoor shower faucet on w wand off button activated? Getting recirc & tempering?
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Old 01-04-2021, 09:50 PM   #4
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Hi, diesel only
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Old 01-04-2021, 10:03 PM   #5
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Hot water runs out quick!

If your diesel burner is running then next item to check is the stir pump. This is a small pump that circulates the coolant to aid in consistent hot water. When it fails hot water tends to run out but then recovers.
If diesel burner is running verify pump is running should be some vibration when hand on pump.
Then verify hot water on hoses in and out of pump.
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Old 01-05-2021, 01:21 AM   #6
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Hot water runs out quick!

No offense intended, but look at the simple, dumb questions first.
1. Is the water getting hot enough? Iím not familiar with the hydro hot, but traditional RV water is usually heated much hotter than nominal residential, usually to 130*. This allows you to use far less hot water to temper the cold, thus stretching capacity.
2. Are you setting it up properly. If you love a hard flow shower head youíll burn through a lot of hot. Start with a very moderate flow of hot, then add juuuuust enough cold to temper it down. This will give you a good temp and adequate pressure without wasting a lot of hot.
My DW was a hot property as an IT system architect, but she has a hard time showering in the coach without exhausting the HW, of which I have never run out in over 8 years. 🤷
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Old 01-05-2021, 10:25 AM   #7
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No offense intended, but look at the simple, dumb questions first.
1. Is the water getting hot enough? Iím not familiar with the hydro hot, but traditional RV water is usually heated much hotter than nominal residential, usually to 130*. This allows you to use far less hot water to temper the cold, thus stretching capacity.
2. Are you setting it up properly. If you love a hard flow shower head youíll burn through a lot of hot. Start with a very moderate flow of hot, then add juuuuust enough cold to temper it down. This will give you a good temp and adequate pressure without wasting a lot of hot.
My DW was a hot property as an IT system architect, but she has a hard time showering in the coach without exhausting the HW, of which I have never run out in over 8 years. 🤷
Hydrohot is a tankless type water heater that uses a 56,000btu diesel burner for virtually endless hot water provided the pump is functioning ---- heats a tank of antifreeze that transfers the heat to the water as it is being used
A Control thermostat maintains the tank at 190*F --158*F
Tempering Valve controls hot out at roughly 125*F +/-

Whole different set up then a Suburban/Atwood Water Heater
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Old 01-05-2021, 10:50 AM   #8
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Thanks...

Quote:
Originally Posted by Old-Biscuit View Post
Hydrohot is a tankless type water heater that uses a 56,000btu diesel burner for virtually endless hot water provided the pump is functioning ---- heats a tank of antifreeze that transfers the heat to the water as it is being used
A Control thermostat maintains the tank at 190*F --158*F
Tempering Valve controls hot out at roughly 125*F +/-

Whole different set up then a Suburban/Atwood Water Heater
Thank you sir...

So what do you think would cause the hot water to run out in say 30 seconds. I'm taking a warm shower, not even hot, trying to preserve hot water. It seems to have gotten worse lately. The pump seems like a good place to start? The water is scalding hot come out of the sink. Do these systems ever need a flush?

Thanks again!

Dan
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Old 01-05-2021, 09:24 PM   #9
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Goggle the Brand/Model for the Manual....lots of good info in those

YES the stir pump as suggested by 'Spk64' would be first place
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Old 01-05-2021, 11:25 PM   #10
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Hot water runs out quick!

Quote:
Originally Posted by Old-Biscuit View Post
Hydrohot is a tankless type water heater........

Whole different set up then a Suburban/Atwood Water Heater
Thank you, OB!
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Old 01-13-2021, 02:14 PM   #11
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Got hot water??

Was stir pump working??

Any update to share........
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Old 01-17-2021, 10:33 PM   #12
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Got hot water??

Was stir pump working??

Any update to share........
Yes sir... An update anyways. I tested it today and I get about 30-40 seconds of really HOT water. It goes to Luke Warm quick and stayed there for 5+ minutes till the end of the test. I turned the water off for a while, burner still running, and then back to really HOT water for 30 seconds. The burner was running constantly and it was definitely "warning" up the water, but never hot till you gave it a minute. Will be back over there Tuesday running some more tests. I have new pumps and new boiler fluid I was going to try one of these weekends...even tho that should not affect my hot water problem. The heat exchanger part of the system works fine. Anybody else think the boiler coolant should be replaced. Mine os 16 years old, but just reading that AquaHot says does not need to be drained, flushed and refilled with new. Really? Thanks for checking!
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Old 01-17-2021, 10:42 PM   #13
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Got hot water??

Was stir pump working??

Any update to share........
Oh, there was NO stir pump running while the AH was heating up or when I was asking for HOT water. They only came on with I turned the Furnace on.

Thx! Dan
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Old 01-18-2021, 12:24 AM   #14
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Try turning on the bedroom zone heater when youíre checking the shower water. Zone pump will act as a stir pump.
You can also contact Roger Burke, one of the most knowledgeable techs.
RV Hydronic Heater Repair - Home
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