What is the size of the drain plug on a Hayward H250? I lost mine.

SOURCE: Drain gas heater for winter

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.

SOURCE: Hayward h250, wont heat

Sounds like it could be the flame sensor.

SOURCE: Hayward H250 pool heater lights

if it is an electronic model you prob have a dirty flame sensor

SOURCE: Hi what size and kind of regulator do i need for

This is something your gas company should figure and supply for libality reasons. they will be responseable for any damage done from improper pressure. They will need to figure along with heater size and tank size, pipe size and run of pipe along with other varebeles like number and type of fittings on line and other appliences on the feed.

SOURCE: How do you install an igniter on the Hayward H250

Please refer to page 30 of this owners manual under the section labeled Ignitor assembley removal.
This should help to guide you through the removal and installation process.


Refer to page 43 if you needs part numbers for ordering, or just need help identifying parts.