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Hi. I've been learning a lot about my aqua hot system from your forum. I recently acquired my new to me 1996 Hawkins motorcoach with the older aqua hot model 413/12. It would originally would run between 15 and 30 minutes then stop. I I serviced it with a new fuel nozel and filter. I have not run it because I needed to drain the old boiler antifreeze, it was in bad shape. I'm hoping someone can help me with a couple of questions. I understand the zone bleeding procedure from the manual but need to get an air blow gun to pressurize the system. Question#1, Do I fill the tank completely with new antifreeze? My manual says 15 gallons then start bleeding procedure. It has 15 gallons in it but is not "full". Question#2, can I use the domestic hot water safely before bleeding the heat zones? Also, I keep reading to mix the antifreeze 50/50. I purchased the camco boiler antifreeze that says "no mixing required" Can anyone clarify? Thanks.

This is an alert to all Aqua Hot users. Our AquaHot's boiler cap was stuck and allowed the boiler to boil out 11 gallons out of 16 gal of coolant over a period of I don't know how long! The cap was so deteriorated (brittle) that the rubber seals came apart in pieces when I removed the cap, which I had to use Channel locks to remove. The missing 11 gallons of coolant was causing the temp of the hot water to fluctuate, which I thought originally was the mixing valve; but after circumstances led me to check the coolant level I found out differently! After cleaning the Boiler cap neck, which was very difficult on our 04 Monaco Exec, because of where it is located and the size of the AquaHot and filling it with coolant, the Electric Heating Element burned out and I had to replace it. The Heating Element Replacement requires that you drain the boiler. Well there went the 11 gallons of Coolant I just put in by pumping it in with a new Weed sprayer, which was a real chore, because of where my boiler's cap and inlet were located! I did have an unused 40 gal blue tank, that I was able to use to recycle the 16 plus gallons of 50/50 coolant mixture. Note: Use Distilled water along with the coolant to achieve the 50/50 solution. This will keep the corrosion down in the room heat exchangers and save you money and trouble in the long run. The AquaHot Owner's Manual & the AquaHot Repair Manual says to check the coolant level in the reservoir tank and neither manual mentions checking the level of the fluid in the Boiler tank OR what type of Coolant to use!. The tank has a radiator cap on top of it like a car's radiator. Do not trust just checking the reservoir's fluid level!!! I would advise everyone with an AquaHot to check the boiler's coolant level. Wait until the boiler is cool. If you can feel that the radiator cap on top of the boiler (Just like a car's radiator cap) is cool to the touch, along with the area around it remove the cap slowly and if the level is correct and full, the coolant will be right up to the cap and may even overflow as you remove the cap. If you cannot see or feel the coolant level go to: http://rvhydronicheaterrepair.com/RVHYDModelInfo.htm and see what type of coolant your AquaHot uses and fill it up. Note: you should find out what type of coolant your AquaHot uses anyway! In any case you should check the boiler cap once a year and replace it every 2 years! You will save yourself a lot of headaches & heartaches, along with a lot of money in repairs! God Bless and have a supper day, Larry the Tweety Coach Guy

I have a 2016 Allegro Bus. We're part timers so we still have yet to get her out because the weather has not cooperated. I winterized it and filled all the pipes with antifreeze. We have trailered for many years so I am not a complete novice. My question: our motor home has an aqua hot system that also heats our coach and the floors. I need to take her out for a drive ( we've named our motor home "Nellie"). Can I run the Aqua Hot heating system to heat Nellie while there is antifreeze in the water lines? I don't intend to turn on any faucets, I just want to heat the entire coach so my wife doesn't freeze! I just can't find anything definitive that answers this question. Thanks for any help you can give and Happy New Year. Peter

Hi. I have an aqua hot system in my 2004 Safari Panther. Just took it out of storage to get ready for a trip and ran the aqua hot to warm up the coach. Not too cold (about 42 degrees) so nothing extreme. After it reached 69 degrees I turned it off at the switch. I used the diesel setting as I do not have a 30 or 50 amp outlet at my house. After about an hour I noticed that the aqua hour was "humming", like something was turning, but did not sound like a fan. I also unplugged the power, but it continued. I've never heard this before. Does anyone have any idea what that sound could be? Thanks got any input. Albert