Possible.The problem with this bypass setup that he could very easily dead head the heater. He would need a three way diverter valve to avoid dead heading.
In my opinion, all heaters should come with a flow switch for this exact reason.
Possible.The problem with this bypass setup that he could very easily dead head the heater. He would need a three way diverter valve to avoid dead heading.
Yes I saw that and you have been a big help!In any case, adding a flow switch was one of the suggestions that I wrote earlier.
Thanks. I'm not familiar with what you are describing. Can you think of any resource where I might find a picture or description of what you are describing.The problem with this bypass setup that he could very easily dead head the heater. He would need a three way diverter valve to avoid dead heading.
Thanks. I'm not familiar with what you are describing. Can you think of any resource where I might find a picture or description of what you are describing.
I guess I'm not seeing how that is very different from what I have, except that it eliminates the human error element that the three way switch solves. But as long as that all three valves are turned on that H, the result should be the same, no? Or is it affecting the flow or pressure in a way I'm not understanding?Heater Bypass - Further Reading
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I guess I'm not seeing how that is very different from what I have, except that it eliminates the human error element that the three way switch solves. But as long as that all three valves are turned on that H, the result should be the same, no? Or is it affecting the flow or pressure in a way I'm not understanding?
We don't have any kind of valve to limit flow. The water from the outlet of the manifold is sent in a direct line into the jacuzzi (in the form of two jets installed on the sides of the "tub").Who is to say that there isn't another valve somewhere closer to the spa and they adjust it for what they would call a comfortable flow at the same time you have this heater running with not enough water flow. The water is cooked and not enough to absorb the heat, kaboom.
Is there any way that that could be happening on it's own? We have the machine room locked so no one can get in there, and I myself leave it set to flow through the heater before guests check in, and then I even kick it on briefly to make sure the heater fires up. I guess what I mean to say is that in theory the heater only turns on when water runs through it, and water only runs through it when I switch the valves so they run through heater instead of looping directly back into the jacuzzi (by passing heater to filter).Yes, a 3 way valve and a check valve on the heater output eliminates human error. Also the check valve will prevent water from backflowing into the output side and release any pressure in the heater should it turn on. Unlike the existing ball valve that totally locks the water and pressure within the heater.
I agree with the conclusion that the heater is likely turning on while both valves are shut and building pressure in the heater that cracks the manifold. The check valve would not let the pressure build like that.
The interesting question I'm seeing hinted at is the one of on-demand heating. I was told that these heaters are on demand, and that you can essentially leave them turned on set to the desired temp, and that all one has to do to "turn on the heater" is to flip the circulation pump. As long as it's properly valved so that the water is properly circulating through the heater, the heater kicks on some kind of internal pump/flow, and about 10 seconds later the heater ignites. Is this not the proper way to do things?
And by "check valve" do you mean the flow switch that others are recommending?I agree with the conclusion that the heater is likely turning on while both valves are shut and building pressure in the heater that cracks the manifold. The check valve would not let the pressure build like that.