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What are common issues with Pentair 400k Natural Gas IID Cupro-Nickel MasterTemp Heater?

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  • Bill Jordan Apr 03, 2015

    Hi tony , I want to help you with your question, but I need more information from you. Can you please add details in the comment box?

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  • 1,631 Answers

Common is so generic.
Many issues can crop up, not necessarily exclusive to any one specific brand of appliance, such as a heater or directly with Pentair.
Overall, they make a good heater!
Keep your filter clean; ensure that chemistry is always balanced, and take care of issues as they arise, immediately (as problems happen to any heater of any brand) and you should have a long happy union with a heater.

Posted on Apr 03, 2015

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SOURCE: Searching for Operating Manual for natural gas pool heater.

pentairpool.com

Posted on Sep 18, 2009

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SOURCE: We just installed a new Raypak 400k BTU cupro

The heater need to be set to max heat and then let the controler control it. Which ever is set the lowest will stop the heater. Good luck and let me know how you do.

Posted on Apr 03, 2010

  • 990 Answers

SOURCE: buying a pool heater. Which brand best reliability

Both of those heaters are fine I prefer the Pentair for it's smaller footprint and ease of installation as you can turn it for access to plumbing. The Hayward is tougher to turn the exchanger on and you only have right or left as options for the plumbing to come out. Sta-Rite is still my favorite for installation being easy to plumb, wire and run gas to. It's very easy to change from natural to LP also.
Most heaters today are the same in reliablity and that is mostly up to you to keep the chemicals correct. Being in the business I always look to ease of install and access for repair.

Posted on Oct 17, 2010

Testimonial: "Thanks for info from an expert. Think I will get a pentair as they are sold in UT. Wholesaler doesn't even carry Hayward. So Techs aren't used to. "

  • 7 Answers

SOURCE: Flow issues through MasterTemp 400

are there shut off vavles you may have overlooked after the the filterpump?

Posted on Jul 19, 2012

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1 Answer

Pentair mastertemp pool/spa heater


Yes, Pentair does make a MasterTemp model heater.

Is that what you needed?

If not, I can keep on guessing...

  • Yes, MasterTemp can be used on a pool, a spa or both.
    • It has a Dual Temperature control, for two separate bodies of water.
  • These heaters come in both types of Fuel consumers: Natural Gas & Liquid Propane Gas
  • You do need to supply electricity to them
    • the supply can be either 120 volts or 240 volts
      • a simple change of a supplied plug
  • If installed indoors you need to vent through the wall or roof
    • Adequate ventilation is required for proper combustion of "Free Air"
  • If installed outdoors, no extra labor required, ready to go
  • Plumbing is simple, just plumb provided unions onto PVC pipe of your system, match up the alignment to the heater & tighten the unions, done.
So sorry, don't mean to be facitious...

But we could use more information to assist you. Your question was sooooo generic.


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Does it stay fired or does the fan just run for a few minutes after you shut it off?

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this heater will display 2 red light related problem 1-service the system mean you need to clean you filter, and service the heater mean it may be a problem with the heater this 2 you will be able to see it in key pad control the heater ,now reset the board and see what happens (CUT THE POWER ON/OFF UNCE )

Jun 09, 2013 | Pentair Pool & Spa

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Buying a pool heater. Which brand best reliability and service. Looking at Hayward H series cupro nickel 400 K Btu Nat Gas. Also considering Pentair MasterTemp CuproNickel 400 K. Will be heating an...


Both of those heaters are fine I prefer the Pentair for it's smaller footprint and ease of installation as you can turn it for access to plumbing. The Hayward is tougher to turn the exchanger on and you only have right or left as options for the plumbing to come out. Sta-Rite is still my favorite for installation being easy to plumb, wire and run gas to. It's very easy to change from natural to LP also.
Most heaters today are the same in reliablity and that is mostly up to you to keep the chemicals correct. Being in the business I always look to ease of install and access for repair.

Oct 17, 2010 | Hayward Pool & Spa

1 Answer

Pentair matertemp 400,000 BTU heater cycles on & off


My pentair matertemp 400,000 BTU natural gas heater cycles on and off before reaching desired temperature. I completely cleaned the DE filter and flow should not be an issue. When running the spa the pressure is 25. When running the cleaning system (polaris pop ups) the pressure is 30. Burner fires for 80 seconds then shuts off, reignites after 53 ceconds.Any tips on what might be the issue with the heater

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