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Thread: Heater making howling/whining sound

  1. Back To Top    #1

    Join Date
    Jul 2015
    White Lake, MI

    Heater making howling/whining sound

    I have a Raypak 206 heater and it is making an annoying howling whining sound. I have checked the heat exchange tubes and they are clear. If I open the intake valve to suck from both the skimmer and the bottom drain the noise stops. However when I am just filtering the hot tub there is only one intake line and the heater continuously makes noise while heating the hot tub. ~ Tony
    My name is Tony. I've never done this before but here goes. I am 65 years old. I live in a Detroit, MI suburb. I have a 31 X 13 in ground fiberglass pool and a separate unground spa. I have a cartridge filter and a Raypak heater.

  2. Back To Top    #2
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: Heater making howling/whining sound

    Hi, welcome to TFP! Have you tried isolating the lines to see if there are any partial clogs or restrictions? Maybe a valve not opening completely?
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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  3. Back To Top    #3

    TFP Guide

    Join Date
    Jun 2012
    western NY

    Re: Heater making howling/whining sound

    My heater does the same thing if I forget and leave the pump on low. Switch it to high and it goes away. It has to do with low water flow. I was told the theory once but don't remember it now.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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