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Just replaced a 12 yo Pentair 400K BTU pool heater with a new Raypak 336K BTU heater. It now takes >2x longer to heat my pool. I did not expect this when going from 400 to 336 btu. Please advise.

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  • Greg Murch
    Greg Murch May 03, 2017

    Hi Michael. It was a Minimax NT.

  • Michael Prior
    Michael Prior May 04, 2017

    First off the BTU out-put of the NT is rated higher but the NT is also a force draft type burner. The Raypak is an atmospheric type burner.
    A burner, either force draft or induced draft will have a more consistent BTU out-put. If it seems very different in out-put you may want to check the header by-pass built into the Raypak. It is thermal activated and may be throwing off the temp-rise of the heater.



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What model Pentair? Master Temp.........?

Posted on May 03, 2017


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Posted on Jan 02, 2017

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SOURCE: i have a Pentair MiniMax NT 250,000 btu pool heater that fails to

Two reasons.

1. There is air in the gas line. Power down the heater and allow it to try igniting until lockout. If it locks out, repeat the process. Most lines will clear within 4-5 attempts to ignite.

2. A plugged burner orifice. Run a small pipe cleaner in the brass fittings on the burner tray. They may have small webs in them restricting gas flow.

If the unit is a Standard (STD on the plate inside) it has a flame sensor that may also be bad. That sensor is on the end of the single wire that is cloase to the ignitor wire near the burners. Also check for a losse ground wire on the heater.

Posted on Dec 21, 2008

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SOURCE: minimax pool heater cuts out at 91 degrees when remotely set for

Check the temp reading on the heater. It is probably set at 91...heater control should be set to 104

Posted on Aug 30, 2009

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SOURCE: I have a 2003 400K btu Pentair MiniMax NT pool

have you tried the thermister?

Posted on Oct 02, 2009

Testimonial: "THANKS FOR YOUR ADVICE!!! Checking the thermister, I found that one of the white wires had broken....spliced ends together and heater now functions!"

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SOURCE: H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1: how do i fix the AO code on my hayward heater?...

AO will apply to your blower, blower tubing, or blower vacuum switch. You need to check these items.

Posted on May 20, 2010

  • 31 Answers

SOURCE: I have a Pentair 40,000 BTU pool and spa heater.

The heater is trying to light but cannot. Either the igniter is broken or you are not getting any gas to the igniter. Check to make sure your gas valves are on.

Posted on Apr 18, 2011

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