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Thread: Help with natural gas H150 heater

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    Help with natural gas H150 heater

    I hadn't used the Hayward H150 heater for 2 years. The pool has been open and running for about a week and all had been heating normally. I had someone spray a finish on the surrounding deck. The over spray got in the pool and clogged the DE filter which I dealt with. Seemingly about the same time the heater began heating only marginally. I'm not sure if the finish going through it is the problem or not.

    The burners are clean and fully firing. I took the manifold off the heat exchanger and snaked the copper tubes to be sure there were no obstructions. The exchanger is clean and clear and in fine shape. The one fault I found was the bypass which looks like a car thermostat was inoperative, frozen in the shut position. I couldn't get one immediately so I put it back together without the bypass. It still does the same marginal heating. I'm going to get the new bypass but it doesn't seem to be the problem as it operates the same with the bypass closed or with the bypass not there.

    I do have a diverter valve and I reduced the flow through the heater until it make knocking noises from steam and then added back enough flow to stop that and still same results.

    So I'm stumped. What could cause a fully firing heater that has a clean as a whistle heat exchanger to only marginally heat? Days before the heater heated just fine with noticeably warm water coming through the return jet. It now produces water that is barely warmer then the pool water through the jet.

    Any help would be much appreciated.

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    Re: Help with natural gas H150 heater

    How have you determined that the heater isn't heating optimally? What size pool do you have? Why not push more water thru the unit? When you bypass lots of water do not expect to feel warm water coming thru the returns as more is being bypassed than heated.

    Well sound like you've done it all. Only possible thing I can think of is a low flame thus not optimally heating the water. If that isn't it I have no clue.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Help with natural gas H150 heater

    Thanks for that. I will look at the possibility of low flame tonight. It seems to be a pretty solid flame. What controls might cause the flame to fire but perhaps not fully? Also I did have more water through the system. Reducing it was just an experiment to see if the output pipe got warmer which it may have a little but of course with all the unheated water blended there was no net difference.

    16x32 above ground oval. Four feet deep.

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    Re: Help with natural gas H150 heater

    Also check and clean the heat exchanger. Pop the top.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Help with natural gas H150 heater

    Thanks did that it's Sioux and span.

    16 x 32 above ground oval pool
    Ecomatic ESC 36 Salt System
    Hayward EC50AC DE Filter
    Hayward H150 Natural Gas Heater

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    Re: Help with natural gas H150 heater

    Quote Originally Posted by pdc View Post
    Thanks did that it's spic and span.

    Sent from my SM-G928V using Tapatalk


    16 x 32 above ground oval pool
    Ecomatic ESC 36 Salt System
    Hayward EC50AC DE Filter
    Hayward H150 Natural Gas Heater

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    Re: Help with natural gas H150 heater

    Any of the fins bent out of shape?
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Help with natural gas H150 heater

    Nope

    16 x 32 above ground oval pool
    Ecomatic ESC 36 Salt System
    Hayward EC50AC DE Filter
    Hayward H150 Natural Gas Heater

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    Re: Help with natural gas H150 heater

    let the heater run for a few hours and measure the water temp difference before and after. With about 95,000 Lbs of water and 150,000 BTU (120,000BTU output) you should see about 1 - 1.25 deg/hr of temp increase per hour. This is the only real way to see if the heater is outputting the rated amount.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Help with natural gas H150 heater

    It was heating at that rate (at least a degree per hour) when I first ran it. After the over-spray (might have been a significant amount) is seemingly when the significant reduction of heating occured. That's why I opened the heat exchanger and snaked the passages. they are very clear, no obstructions or goo in there.
    16 x 32 above ground oval pool
    Ecomatic ESC 36 Salt System
    Hayward EC50AC DE Filter
    Hayward H150 Natural Gas Heater

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    Re: Help with natural gas H150 heater

    I misspoke in my original description. It was the thermostat that was faulty that is now not installed (new one will be here Thursday). Amazon.com: Hayward HAXFCT1930 Flow Control Thermostat Replacement for Hayward H-Series Ed1 and Ed2 Style Pool Heaters: Patio, Lawn Garden

    Could it be something to do with the bypass valve kit? Amazon.com: Hayward HAXBPK1932 By-Pass Valve Kit Replacement for Hayward H-Series Millivolt Electronic ED1 Style Pool Heater: Patio, Lawn Garden
    16 x 32 above ground oval pool
    Ecomatic ESC 36 Salt System
    Hayward EC50AC DE Filter
    Hayward H150 Natural Gas Heater

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    Re: Help with natural gas H150 heater

    Yes you replaced the flow control thermostat. If the bypass is still solid and in good shape, makes no sense to replace it. Does the unit not have a digital display? If not I wouldn't spend too much money on it.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Help with natural gas H150 heater

    Quote Originally Posted by ps0303 View Post
    Yes you replaced the flow control thermostat. If the bypass is still solid and in good shape, makes no sense to replace it. Does the unit not have a digital display? If not I wouldn't spend too much money on it.
    Would the flow control thermostat have this effect? Currently it is running with no flow control thermostat. I reassembled with it out until the new one gets here. No digital display.
    16 x 32 above ground oval pool
    Ecomatic ESC 36 Salt System
    Hayward EC50AC DE Filter
    Hayward H150 Natural Gas Heater

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    Re: Help with natural gas H150 heater

    If I remove what I think is the thermostat sensor, the copper probe with a hard wire that goes into a tube on the exchanger, will that cause the burner to stay on constantly.

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    Re: Help with natural gas H150 heater

    Yes it could and is not advisable.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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