Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: Water temperature coming out of Heat Exchanger?

  1. Back To Top    #1

    Join Date
    Oct 2015
    Location
    Huntington, NY
    Posts
    76

    Water temperature coming out of Heat Exchanger?

    I am used to swimming in friends' pools who have traditional gas/propane/electric element heaters where the water simply passes through a hot element of some sort and returns to the pool warmer than it left it. when you feel the jets/returns in these pools the water feels significantly warmer than the surrounding water when the heater is on. Now i have a pool of my own after recently purchasing a house. It has a hayward heatpro titanium heat exchanger 110k btu model hp21104t. I turned it on for the first time today and i noticed that the water coming out of the jets is barely any warmer than the pool water. is this normal? its about 75 degrees outside and my pool is about 67 degrees. i had it set to 90 just for testing purposes. is this normal performance for a heat exchanger? i'm not complaining that it isn't heating the water fast enough in the pool, i'm just curious as to how it can even heat the pool if the water coming out of it is barely warmer than the water leaving the pool? FWIW, the heat exchanger read a temperature of 69 deg, the SWG (downstream from heat exchanger) read a temperature of 70. I understand how a heat exchanger works, as it is basically just an air conditioner in reverse. the pool water runs through the condenser and the refrigerant that is 'cooled' by the pool water absorbs heat from the air at the evaporator. i know they do not heat as quickly as gas/element heaters but i imagine that the water should be more than a degree warmer than the pool water.

    Side note, when i first turned it on the fan wouldn't turn on. i called hayward and they said either my fan motor is bad or that the motor is not getting voltage. i take off the front panel to see that one of the wires on the board going to fan was CUT. anyway i fixed it and it fired right up. the compressor was working as i could hear the relay.
    22,500 IG w/ Dark Vinyl Liner | Installed 2011 | Hayward Aqua-Rite SWG | Hayward Swimclear Cartridge Filter | Pentair Intelliflo 011018 | Polaris Booster Pump | Polaris Pressure side Robotic Cleaner | Hayward Titanium 110k BTU Heat exchanger (broken soon to be replaced with solar)

  2. Back To Top    #2

    Re: Water temperature coming out of Heat Exchanger?

    Heat pumps heat incrementally (they extract heat from ambient air) so there's no other source of heat to draw from. You get a lot less immediate response than a gas or conventional electric will give you. It's also not the best solution for a 30,000 gallon pool. Look at the chart on page 5:

    https://www.hayward-pool.com/pdf/man...-HP2xxxxBT.pdf

    At an ambient temp of 75 degrees it will take about 160 minutes to heat the pool by 1 degree (or roughly 61 hours to heat it to 90 degrees - assuming no heat is lost over 2-1/2 days).
    Geebot
    Chicago, IL
    30K gal, InGround Plaster Finish, 3.5'-9.5', Maytronics S300 Cleaner

  3. Back To Top    #3

    Join Date
    Oct 2015
    Location
    Huntington, NY
    Posts
    76

    Re: Water temperature coming out of Heat Exchanger?

    Wow thanks for the detailed reply. So it sounds like these are great for barely heating the water as efficiently as possible lol. So without replacing the unit is my best bet to just get a solar blanket? It sounds like relying on this to actually heat my pool is a waste of time and energy so I guess I'm just best served letting the dark liner absorb as much light as possible and use a solar blanket to keep heat in by reducing evaporation?

    After looking at your numbers I don't even understand the purpose of having one of these to heat a pool.
    22,500 IG w/ Dark Vinyl Liner | Installed 2011 | Hayward Aqua-Rite SWG | Hayward Swimclear Cartridge Filter | Pentair Intelliflo 011018 | Polaris Booster Pump | Polaris Pressure side Robotic Cleaner | Hayward Titanium 110k BTU Heat exchanger (broken soon to be replaced with solar)

  4. Back To Top    #4

    Re: Water temperature coming out of Heat Exchanger?

    Quote Originally Posted by jeffblue View Post
    Wow thanks for the detailed reply. So it sounds like these are great for barely heating the water as efficiently as possible lol. So without replacing the unit is my best bet to just get a solar blanket? It sounds like relying on this to actually heat my pool is a waste of time and energy so I guess I'm just best served letting the dark liner absorb as much light as possible and use a solar blanket to keep heat in by reducing evaporation?

    After looking at your numbers I don't even understand the purpose of having one of these to heat a pool.
    Actually, once the pool gets up to temp heat pumps can maintain the heat relatively efficiently (would be nicer to have a larger unit for 30,000 gallons), so I wouldn't discount it completely.
    Geebot
    Chicago, IL
    30K gal, InGround Plaster Finish, 3.5'-9.5', Maytronics S300 Cleaner

  5. Back To Top    #5

    TFP Guide

    Join Date
    Jun 2012
    Location
    western NY
    Posts
    1,557

    Re: Water temperature coming out of Heat Exchanger?

    make sure the unit is clean. The evap and condens coils can get clogged up with stuff inhibiting air flow
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

  6. Back To Top    #6

    Join Date
    Oct 2015
    Location
    Huntington, NY
    Posts
    76

    Re: Water temperature coming out of Heat Exchanger?

    Quote Originally Posted by danpik View Post
    make sure the unit is clean. The evap and condens coils can get clogged up with stuff inhibiting air flow
    i will try that and see if it makes a difference. but basically my understanding is that its normal that the water coming out of the jets is not significantly warmer than the water in the pool?

    Quote Originally Posted by Geebot View Post
    Actually, once the pool gets up to temp heat pumps can maintain the heat relatively efficiently (would be nicer to have a larger unit for 30,000 gallons), so I wouldn't discount it completely.
    oh i didn't mean its a flawed system, but it seems like in this application it is kind of underwhelming
    22,500 IG w/ Dark Vinyl Liner | Installed 2011 | Hayward Aqua-Rite SWG | Hayward Swimclear Cartridge Filter | Pentair Intelliflo 011018 | Polaris Booster Pump | Polaris Pressure side Robotic Cleaner | Hayward Titanium 110k BTU Heat exchanger (broken soon to be replaced with solar)

  7. Back To Top    #7
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Water temperature coming out of Heat Exchanger?

    A cover will certainly greatly reduce the heat that is typically lost at night and to evaporation.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

Posting Permissions

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