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Thread: Advice on re-plumbing for new heater

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    Advice on re-plumbing for new heater

    Hello

    I am looking for a little advice on plumbing up my new heater, it is a hayward H400FND, it replaced an older H400HDL. So as you can see by the picture the manifold spacing is wider on the new heater. I'm hoping that two 90 PVC elbows will do the job for for sides. I will buy a bunch of elbows and what not and test fit everything first. My main question is, do I need to have the loop in my system with the diverter valve? Any recommendations on how to plumb this? this is my first attempt at pool plumbing, I have only done plumbing for fish tanks before.

    Thank you
    Attached Images Attached Images
    -9000 Plaster IGP and attached spa with 4 jets , Hayward H400IDL NG heater, Hayward swimclear 4025 cart filter, Hayward superII 2hp pump, Goldline controls ps-8 controler with T-cell 15, Caretaker 99 in-floor cleaner and polaris in-ground leafetrapper.

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    JasonLion's Avatar
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    Re: Advice on re-plumbing for new heater

    With careful use of 45 degree fittings you can probably get the number of fittings down to one 45 and one 90 on each side. Having fewer fittings is better, but it isn't a disaster or anything if you need to use an extra fitting or two.

    The loop and valve are a heater bypass. Unless your pump is very very large, you don't really need a bypass. A bypass like that one can be used to improve the efficiency of the plumbing when the heater is going to be turned off for a while. While added efficiency is nice, it is hardly essential.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Advice on re-plumbing for new heater

    Thank you for the quick reply. i do not use my heater that often, summers here in Las Vegas are a killer. is it recommended to not have water flowing through the heater constantly?
    -9000 Plaster IGP and attached spa with 4 jets , Hayward H400IDL NG heater, Hayward swimclear 4025 cart filter, Hayward superII 2hp pump, Goldline controls ps-8 controler with T-cell 15, Caretaker 99 in-floor cleaner and polaris in-ground leafetrapper.

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    Join Date
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    Re: Advice on re-plumbing for new heater

    Get rid of the bypass. Cut the loop off a foot or so above the ground.
    If you want to, use flex PVC and eliminate the 45's and 90's all together. Dont let anybody tell you flex wont work. It will. Somebody might tell you the water's too hot coming out of the heater. Don't believe them. I've seen a lot of heaters plumbed with flex like that, including mine. Works just fine.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Re: Advice on re-plumbing for new heater

    I would be happy to use flex pipe, I have been test fitting pvc and it seems like a PITA.
    -9000 Plaster IGP and attached spa with 4 jets , Hayward H400IDL NG heater, Hayward swimclear 4025 cart filter, Hayward superII 2hp pump, Goldline controls ps-8 controler with T-cell 15, Caretaker 99 in-floor cleaner and polaris in-ground leafetrapper.

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    Re: Advice on re-plumbing for new heater

    I. Called Hayward tech support and they said that flex pvc was ok to use.
    -9000 Plaster IGP and attached spa with 4 jets , Hayward H400IDL NG heater, Hayward swimclear 4025 cart filter, Hayward superII 2hp pump, Goldline controls ps-8 controler with T-cell 15, Caretaker 99 in-floor cleaner and polaris in-ground leafetrapper.

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    Join Date
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    Re: Advice on re-plumbing for new heater

    Quote Originally Posted by bent240lv
    I. Called Hayward tech support and they said that flex pvc was ok to use.
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Re: Advice on re-plumbing for new heater

    One thing I would suggest is to use a fireman's switch if you're going to use a timer for the pump. The fireman's switch will shut off the heater before the pump to allow the heater to cool down before shutting off the pump.

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    Re: Advice on re-plumbing for new heater

    I had to use rigid pvc in the end. The 2" flex did not have enough bend radius to work.
    -9000 Plaster IGP and attached spa with 4 jets , Hayward H400IDL NG heater, Hayward swimclear 4025 cart filter, Hayward superII 2hp pump, Goldline controls ps-8 controler with T-cell 15, Caretaker 99 in-floor cleaner and polaris in-ground leafetrapper.

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    Join Date
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    Re: Advice on re-plumbing for new heater

    Let's see some pics
    15,600 Gallon, 16' x 32' In-Ground Vinyl Pool
    Pentair VS 3050 pump, Quad DE 60 filter and SunTouch controller
    8 gallon Liquidator, Aquatherm EcoSun Solar Panels, 2 wheel ThePoolCleaner

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