Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1
I just found the same problem after replacing my ingiter and gas valve this week. Leaks right above the new valve. I'm going to try JB Weld, which comes in alot of different applications, and you can get at most Automotive stores. It worked pretty good on an exhaust leak I had once. Good luck and I'll let you know how it works out. My heater is still heating the water but makes a knocking noise when starting and of course, the water is leaking.
Posted on Jun 09, 2010
I had the same problem with a 10 yr old heater. You can get the whole heat exchanger assembly, but it is quite expensive. $700 - 900 depending upon the model.
I found on my exchanger that I had developed a leak in the copper right next to the manifold (large black plastic piece on one end of the copper). I tryed to solder the leak but had no luck from the outside. Dis-assembled the exchanger and tried to solder from the inside of the tube, again with no success. I finally cut the opposite side of the tube that was leaking to avoid steam pressure build up and plugged this one leaking element at the manifold. Here is the funny part, I couldn't find a copper plug to fit the id of the tube, so I used a synthetic cork from one of my wife's wine bottles and high temperature RTV, blue, the same that is used on automotive water pumps. Worked great!
This does reduce the total flow of H20 through the heater core, but solved the leak. I will be replacing the exchanger in the near future, but this got me through the winter and eliminated the water loss.
Posted on Aug 19, 2010
Dad burned spel checker ..."I dont think it will ever be RIGHT however ..."
Check the temp on that eoxy you will be using ... of course if this is the last ditch effort ... might as well go for it. Along those lines ... there are lots of interesting epoxy type materials you might consider. Go to the Ace Hardware in your town and look at the offerings on the shelf. 'Liquid steel' might be something for you to consider.
Good luck on your project.
Thanks for your interest in FixYa.com
Posted on Jun 07, 2010
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Posted on Jan 02, 2017
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Aug 30, 2011 | Hayward Pool & Spa
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Does the banging continue until the heater eventually shuts off or does it quit shortly after the heater burners start up? In either case you can repair the heater for much, much less than a new unit. The bypass may be the issue if it is stuck closed. You will also want to inspect the control valve in the header and inspect the overall condition of the heat exchanger. It is likely aggressive water has damaged some or all of these parts causing the banging noise you hear. It is also possible there is an issue with the pump and/or filter not getting enough flow thru the heater but I have to assume your pool man eliminated those possibilities when he looked at the heater.
Was the pool man not able to repair or at least inspect the heater further for you?
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