Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 4 of 4

Thread: Help me diagnose: Low flow after installation of new pool heater

  1. Back To Top    #1

    Help me diagnose: Low flow after installation of new pool heater

    I just replaced my pool heater that was about 10 years old. It was rusted beyond repair and I replaced it with a smaller, more efficient model. I had a Pentair 400,000 BTU heater that hadnot worked for almost a year. I had a pool company install a Pentair MasterTemp Low NOx Pool Heater - Electronic Ignition - Natural Gas - 400000 BTU heater. Heater works fine but my flow to the spa and pool is now much lower at the same pump speed.

    I have a Hayward Echostar variable speed pump and run my pool at around 1200 RPM on low speed. This is normally just fine to get good flow to the pool, the spa overflow and the returns. Now, after the the new heater has been installed, I have to turn the speed up pretty significantly to get the same flow.

    Can anyone help me diagnose the problem? The installer I used did not seem very knowledgeable so there may be something that was incorrectly installed.

    The cartridge filter is relatively clean and the flow was fine just yesterday (with the old heater), so I can probably rule out a dirty filter.

    Do any experts have thoughts as to what might be going on?

  2. Back To Top    #2
    borjis's Avatar
    Join Date
    Aug 2014
    Location
    Pacific NW
    Posts
    2,609

    Re: Help me diagnose: Low flow after installation of new pool heater

    Has the PSI on the gauge changed?
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  3. Back To Top    #3

    Re: Help me diagnose: Low flow after installation of new pool heater

    At higher speeds, the pressure has gone up, but I don't thing the pressure has increased at the cartridge filter at the same speed I used to run the pump.

  4. Back To Top    #4
    Mod Squad Jimrahbe's Avatar
    Join Date
    Jul 2014
    Location
    Bedford, TX
    Posts
    9,321

    Re: Help me diagnose: Low flow after installation of new pool heater

    Hammer,

    I would make sure the installer has the Input and Output connected correctly...

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •