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    Mastertemp 200 - 3 cracked manifolds!!

    Thank you. So this is interesting, because I'm nearly certain the pentair guy here said he would put the flow switch in the outgoing line from the heater! I guess it makes sense that if there's flow coming in there will be flow going out, but it seems intuitive to me that the incoming line would...
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    Mastertemp 200 - 3 cracked manifolds!!

    Right now the guests turn on the hot tub simply by flipping one switch, which is the circ pump switch. The valves are left in position so that the water circulates through the heater, and, critically, the heater is left "on" all the time, so that all they have to do is flip that switch and the...
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    Mastertemp 200 - 3 cracked manifolds!!

    So am I correct in understanding that the check valve allows water to flow one way but not back flow the other? Because that check valve is where my technician said he would put the flow switch. Or rather he would put something there that I gathered would be wired back into the heater (flow...
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    Mastertemp 200 - 3 cracked manifolds!!

    Haha, everything in Guatemala is non-standard! I'm laughing. I understand what you are saying but it's so strange, because I've never noticed the heater to run when the pump doesn't. But I suppose one possibility is that my caretaker, who is supposed to filter the pool while guests are...
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    Mastertemp 200 - 3 cracked manifolds!!

    And by "check valve" do you mean the flow switch that others are recommending?
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    Mastertemp 200 - 3 cracked manifolds!!

    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...
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    Mastertemp 200 - 3 cracked manifolds!!

    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"). Here's a pic of the jacuzzi that I happen to have on my computer. I'm basically standing in front of...
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    Mastertemp 200 - 3 cracked manifolds!!

    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...
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    Mastertemp 200 - 3 cracked manifolds!!

    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...
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    Mastertemp 200 - 3 cracked manifolds!!

    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.
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    Mastertemp 200 - 3 cracked manifolds!!

    Yes I saw that and you have been a big help!
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    Mastertemp 200 - 3 cracked manifolds!!

    FWIW, the official rep for Pentair came today and said that he though the issue was from the flow switch, or the lack of having one. Specifically because the heater was several feet above the jacuzzi, it was necessary and he said that you only get cracks like mine (it actually was in two pieces...
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    Mastertemp 200 - 3 cracked manifolds!!

    All interesting thoughts. The most curious thing of all is that a manifold broke when we installed a completely different heater. Granted, it may also have had some of these issues, but after this happening three times it really does feel like it's something related to the pump system or...
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    Mastertemp 200 - 3 cracked manifolds!!

    Propane, from 100lb tanks. I would say the line runs about 10 feet in a cirucuitous route to get to the heater. I don't believe there is a second regulator near the heater.
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    Mastertemp 200 - 3 cracked manifolds!!

    The valves are closed in this picture because it was taken when the jacuzzi was being emptied through that hose from the filter. When the heater is running those vertical valves are open and the horizontal one between them is closed. The line on the right goes into the inlet port.
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    Mastertemp 200 - 3 cracked manifolds!!

    Well, the only thing I'm sure about from your questions is that the water enters through the top in the picture you see of the heater, and comes out the bottom. The water is definitely going into the heater (rather than not when it's by-passed to just filter) because the water gushes out of it...
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    Mastertemp 200 - 3 cracked manifolds!!

    Can't see it very well but the crack is where the arrow points...
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    Mastertemp 200 - 3 cracked manifolds!!

    I would say the base of the heater is 3-4 feet above the water level of the pool.
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    Mastertemp 200 - 3 cracked manifolds!!

    Two pics from the pump room which sits below the heater.
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    Mastertemp 200 - 3 cracked manifolds!!

    I do or can get pics of everything. The Filter pressure is normally around 10 psi, never more than 15 before we clean it. Manifold says not to exceed 50 psi.
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    Mastertemp 200 - 3 cracked manifolds!!

    Hi There, Posting the first time. I have a mastertemp 200 that is installed on a concrete platform that is the roof of a small machine room where the pump, filters, etc are located (also installed on concrete). The heater is for a large 8 person spa, and is located in Antigua, Guatemala (which...