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Old 12-03-2010, 06:50 AM   #1
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Hydro-Hot Fuel Pressure

I u nderstand the HH fuel pressure should be set at 145psi. How do you check the pressure?

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Old 12-03-2010, 07:22 AM   #2
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With a fuel pressure gauge. I made one from an old nozzle and a 200PSI gauge I bought at Lowe's for $8. Just drill and tap the nozzle to accept a 1/8 NPT. The instructions for checking fuel pressure are in the service manual you can download from HH website(Aqua Hot). On a scale of 1 to 10 I would say this is a 6 due to the fact you have to turn the burner on with it removed from the unit and the ignition system disabled.

The fuel pump has an adjustment screw.

Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy
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Old 12-17-2010, 11:36 AM   #3
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Her is a guy that know Aquahot/Hydrohot forward and backward. I have had 4 different technition work on my Aquahot all left problems when I paid the bill. It still smoked. Then on the 4th try I met Roger Berk.
RV Hydronic Heater Repair - Home Trust me Roger knows what he is doing. He fixed the smoke, adjusted the fuel pressure, removed a rubber air intake hose that did not belong and it finally runs clean. Now I doubt that my neighbor will even smell it. He carries all spare parts with him Roger does travel and he will tell you on his website where he is at any time. I think he is going to be in Quartzsite in January
Ross Starkenburg
2017 Newmar Dutch Star 4369. Spartan chassis w/full disc brakes. 2015 Jeep Grand Cherokee toad
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Old 12-29-2010, 10:45 AM   #4
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Roger is a great tech. He also manages the Hydronic heating group with loads of useful information.

HydronicRVHeating : Hydronic-RV-Heating

With the service manual and a little effort theses HHs are easily serviced by a good DIYer.

Roger also has an online store that service parts can be purchased through.

Parts Available - Items - Parts - RV Hydronic Heater Repair
Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy
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Old 12-30-2010, 09:45 PM   #5
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HH/AQ had a bad lot of nozzels come through, I don't know when it started or when they figured it out and fixed the issue. I assisted the tech who did my service and it smoked like a old coal fired plant. After I got through with the HH certified training, they gave me a new nozzel, and I changed it when we got home. Works perfect now. The rubber boot WRV installed was not necessary, and they put it on I think to keep critters out of the coach. If the air intake does not extend about 1/2-1" below the bottom of the coach, I would add a little bit of pipe maybe. There is also a air shutter adjustment, and it's best to adjust it by sound, a qualified tech will know it's best setting. HH did paint some red paint on the spot they tested the unit to so you can also use that point to set it too.
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