Question about Hayward 250kbtu Ng Pool Heater - Inground

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Drain gas heater for winter

How do you drain a hayward H250 gas boiler

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On the side of the heater, you will see the water connections. Directly underneath them, on that black component that they attach to, there is a drain plug of some description. It may be a draincock, or just a plug. In either case, simply open or remove it to safely drain your heater. In a pinch, you could also disconnect the water connections at those unions (the big grey connectors), but they can be fussy to reassemble, and you run the risk of losing the o-rings.

Posted on Jan 02, 2009

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I need to winterize my Hayward 300. Where the manual shows a drain valve there is a thick square bolt. I'm afraid to compromise it if it is not in fact a bolt.

That is the drain plug...underside of the inlet/outlet header. You should also break open the connection of the water tube to the pressure switch inside the heater to prevent the switch or tube from freeze damage.


Sep 20, 2011 | Hayward H-series Electronic Gas Pool...

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How do I drain the water from my Hayward heater for the winter

There should be a drain plug on the bottom of the header. This is common on most of Hayward's in-ground pool heaters. Since you did not give your model Number, I can't say 100%. You can also check Hayward's website for the manual and look under "winterization". you should be able to find your product manual here: Hope this helps. If you need further assistance post a reply in the comments, and don't hesitate to leave good thumb rating if you found this helpful. Thanks, and good Luck!

Oct 01, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

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First year with my new Hayward H 250fd heater. Closing pool this weekend and live in Michigan so you understand our winters. What do I have to do other than opening the drain plug if anything.

Other than the drain you'll need to remove the pressure switch from its feeder tube and leave it hanging by its wires for the winter. Be sure the heater is level or tilted towards the header to allow all the water to drain out. More than a few people have lost a heat exchanger to freeze damage after draining it because the heater wasn't level and water remained in the low end of the tubes.


Sep 08, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

I need to drain the boiler for winter shut down

There should be a drain valve/plug under the inlet/outlet header. Opening that should allow it to drain thoroughly. Depending on where you live, this should be done in conjunction with the rest of your pool winterization. All suction and return lines should be blown out and plugged as well as all equipment including pump and filter.

Oct 20, 2009 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

How do you winterize?

pull the three (or so) drain plugs in your heater ... use a shop vac (without the filter in it) to blow and then **** out any remaining water.

hopefully, your pressure and suction pipes lead away and down from the boiler. Make sure you **** out those pipes as well.

You know how to drain your filter(s) and pumps ... right?

I hope this helps you


Oct 05, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

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Hayward h250, wont heat

Sounds like it could be the flame sensor.

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