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Thread: Adding a gas heater - plumbing layout

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    Adding a gas heater - plumbing layout

    Hey -

    I currently have an 8x20 solar panel heating that I put in last summer. It does a good job, when we have sun. This year I purchased a gas heater and want to add it in. I put the solar in using 3/4" black tube, moreso as a trial. This year I'll be replumbing it with 1.5" PVC.

    The manual states that I should not feed from solar into the gas heater. My guess is the water coming out of the panel may be warm and then the gas heater won't trigger.

    So my plan is to plumb it such that I use one or the other.

    This is what I was thinking:



    Just want to make sure I'm not doing anything silly.

    Thanks.
    15x30 SWG AGP, 1HP Pump
    8x20 Solar Heating

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    laceygirl's Avatar
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    Re: Adding a gas heater - plumbing layout

    Nice graphic... I wish I knew more about plumbing to be able to help you....But it looks correct, its being supplied with cold water, hopefully someone will be along soon...
    Intex Rectangle 18 x 9 x 52', 4544 gallon (18000 litres), 0.75 hp pool pump, 100 sqft Zodiac Titan Cartridge Filter - 40mm, Stenner Peristaltic Pump chlorine injection system, Intex Over The Wall Skimmer, Intex Fittings with 40mm plumbing Lil Patch Of Heaven. Build/Construction http://www.troublefreepool.com/threa...lice-of-heaven

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    Re: Adding a gas heater - plumbing layout

    Found my first problem. This design forces me to send water to the NG Heater or Solar...doesn't allow me to bypass the whole heating. DOh!
    15x30 SWG AGP, 1HP Pump
    8x20 Solar Heating

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    Mod Squad jblizzle's Avatar
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    Re: Adding a gas heater - plumbing layout

    Ideally, you would have the ability to run the water through the solar first and then the NG heater. Or be able to shut off the solar and just run through the heater. There is really no huge reason to have to bypass the NG heater too, but that would be nice I suppose.

    I think you are going to need some more 3-ways

    - - - Updated - - -

    Note it is always best that the common pipe uses the middle port of the 3-way valve (like your red one, not your blue one)
    Jason, TFP Moderator
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    mas985's Avatar
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    Re: Adding a gas heater - plumbing layout

    Bypassing the heater on the solar return could be an issue with some heaters alarming unless the heater is shut off (no power) during the use of solar.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
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    Re: Adding a gas heater - plumbing layout

    Is this any better? From a little research it seems preferred to keep water running through the heater. This will allow me to isolate the gas and solar heater if need be. Also it allows me to keep water running through the solar panels as well to keep them cool during the day.



    This picture comes from the manual, and leads me to believe that the heater can be bypassed, but maybe that's just if too many GPM

    15x30 SWG AGP, 1HP Pump
    8x20 Solar Heating

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    Mod Squad jblizzle's Avatar
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    Re: Adding a gas heater - plumbing layout

    That should work. Again note the orientation on the 3 way valve is not ideal. May also need a check valve on the solar return before teeing into the heater input.

    You could put a limited heater bypass in front of the heater by connecting the pipes with a shut off valve. Closed, all flow goes through heater. Open, some can bypass.
    Jason, TFP Moderator
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    Re: Adding a gas heater - plumbing layout

    So something like this? I don't see how making the filter to NG heater the common pipe being better (since I also would have to put a new 90)

    I've put the check valve in, as well as denoted where I will have unions. The unions serve the purpose in-case of replacement/failures, as well to assist with putting things away for winter.

    15x30 SWG AGP, 1HP Pump
    8x20 Solar Heating

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    Mod Squad jblizzle's Avatar
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    Re: Adding a gas heater - plumbing layout

    No, that is not what I mean. The common pipe is coming out of the filter, which ideally would go the middle port. this gives you better control of the flow through the valve without choking the flow.

    It will work either way you drew it, just not optimally.
    Jason, TFP Moderator
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    Re: Adding a gas heater - plumbing layout

    Well I'd like to get it optimal. I'm not sure what you mean though as "going to the middle port"..unless you mean to the middle port of the T?

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    Mod Squad jblizzle's Avatar
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    Re: Adding a gas heater - plumbing layout

    Yes the middle part of the 3 way tee.

    Rotate the valve in your last picture 90 degrees clockwise and move it down slightly. Then a 90 turn in from the filter and a 90 turn out to the heater.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Adding a gas heater - plumbing layout

    OK so this is what I ended up with, which now makes your comments make sense...

    15x30 SWG AGP, 1HP Pump
    8x20 Solar Heating

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    Mod Squad jblizzle's Avatar
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    Re: Adding a gas heater - plumbing layout

    You going to move that paver to be under your filter again?

    So The 3-way is currently set for all solar right? Doesn't that blue valve need to be open? To me it looks like you can not have any flow in the configuration in the picture.

    Did you put a check valve on the solar return that is not in the picture?

    - - - Updated - - -

    And if you do not want to send all the flow to the solar (like if it is a small solar array), then just turn that 3-way a little CW to allow some of the flow to bypass the solar.

    In fact, on a hot day, I would start with the valve in the middle and then slowly close the heater forcing more flow to the solar until the panels are cool to the touch, that will be enough flow for the solar and not over-pressurize them.
    Jason, TFP Moderator
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  14. Back To Top    #14

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    Re: Adding a gas heater - plumbing layout

    Yes, I will be putting a paver under the filter.

    The 3 way is open to the filter. The blue valve is closed (it should be open). I haven't filled up my pool yet. I was actually just taking a break when I took this pic

    Basically if there's flow to the solar, blue valve will be open, otherwise closed. I did not put a check valve on the solar return.

    I do obviously want to keep the panels cool to the touch on hot days.

    I haven't finished glueing any of the solar feed/return yet. I'm just trying to get the main part done so I can close valves and let the pool fill up.

    Tonight I hope to finish up some of the solar, but I may run short on 10 ft PVC pipe.

    My goal is to have the pool -> gas heater -> pool working before Wednesday morning cause the natural gas guy is coming out.
    15x30 SWG AGP, 1HP Pump
    8x20 Solar Heating

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    Mod Squad jblizzle's Avatar
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    Re: Adding a gas heater - plumbing layout

    If you used a check valve instead of the blue valve. Then you would only need to turn the 3-way for solar/no solar and not have to remember to close the blue valve as well.

    If you ever add a solar controller (which certainly help optimize the heat addition), you will need a check valve on the solar return line.
    Jason, TFP Moderator
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    mas985's Avatar
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    Re: Adding a gas heater - plumbing layout

    You should also have a check valve right after the filter or the panels will drain backwards through the filter when the pump is shut off.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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