Question about Hayward H Series Propane Electronic Ignition Heater 150,000 Btu

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My propane heater rumbles and thumps when turned on.

Its less noise when I turn the pump on to high speed.

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Sounds like you have a 2 speed pump. The heater needs high speed to operate. The noise is due to the low water flow. The water is actually boiling in the heater. Crank up the flow and that should solve your problems.

Posted on Dec 21, 2008

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Thank you for posting your question here on Fixya.com.


IS it only with the heater on? The only possible issue that causes heater to whistle is poor air flow during combustion. If it is the heater you'll need to look at any surrounding obstructions to clean air flow...things like bushes, grass, fencing...If the heater is off and the noise persists try to narrow it down to which motor is making the noise and repair the bearings.

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If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!

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Thank you for posting your question here on Fixya.com.


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 valve inside the header may be the issue if it is stuck closed. You will also want to inspect the thermostatic 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.

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If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


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It is very hard to trll what is going on the way you describe it. It sounds like you have nothing at low speed on the pump but when you kick it up to high speed you get a cycling on and off of the heater.
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