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Thread: New Heater Installation - separate breaker?

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    New Heater Installation - separate breaker?

    Folks,

    Getting ready to install a new H400FDN in my system. I have seen other folks jump the heater off of the pump. I have also read other posts that suggest this is a bad idea due to a large startup load for the heater blower. My pump is currently on a 20 AMP breaker. So my questions are:

    1. Should I install the heater on its on breaker?
    2. If yes, what size? 15 AMP? 20?
    3. Better to run the heater at 240 or 120V

    Any help is appreciated!
    16 x 42 x 24 IG Vinyl True-L, 27,000 gallons, full width steel steps, 8' Cuddle cove swimout, 2 X Colorlogic 4.0 LEDs, Hayward Tristar 1 hp 2-speed pump, Hayward SwimClear C3025 Cartridge filter, Hayward Aqua-Plus PL-PLUS Controls + Chlorination, Hayward low-Nox 400K BTU heater, Tigershark QC, TF-100 test kit

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    BoDarville's Avatar
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    Re: New Heater Installation - separate breaker?

    While there may be a start-up load for the heater's blower (fan) motor, there is also a higher start-up wattage for the pump motor as well - and that's the one I would be more concerned about. Sometimes, the start-up wattage on an electric induction motor can be up to 3 times the listed operating wattage of the motor. The start-up wattage usually lasts for a few seconds and, for this reason, circuits have a time-delay before tripping to allow for this very temporary higher than normal amp draw during start-up. If both the pump motor and blower start up at the same time the breaker could trip - it depends on the breaker and the wiring as well as the efficiency of both motors.

    You need to know the wattage of both the pump motor and the heater's blower motor. Both should have a label indicating either the wattage or the amp draw at a given voltage (usually 115/120V or 230/240V). This will help determine if the current 20 AMP circuit is sufficient for both devices.

    Keep in mind that the electrical load that a circuit can safely handle is determined primarily by the wire gauge and the line voltage. The breaker is a safety device that shuts off the circuit if the amp draw exceeds what the wiring can accommodate. It is vital that the breaker is matched to the voltage and amps that the installed wire gauge can handle. If the breaker is over-sized for the existing wiring, that is asking for trouble in the form of a fire risk. Conversely, a smaller breaker installed on a circuit that has the capacity to handle more amps increases the likelihood of "nuisance" tripping (this is conceptually how the 1965 NYC-East Coast blackout occurred - but that's another talk show).

    If any of this sounds even remotely unclear, I would recommend hiring a licensed electrician to make the determination as to how these devices should be wired up. In addition, he/she will be aware of any local codes, aside from amp draw concerns, that may dictate how these items should be wired up. They will also check the existing circuit wiring and make sure that it is properly breakered. If you inherited the current setup, an electrician's expertise on this alone would be worthwhile. Many people take the cheap route by installing a breaker that is too large for the existing wiring and this is not something you want. Electricians I have talked with over the years state that they see this a lot.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    Re: New Heater Installation - separate breaker?

    I have the same heater jumped on the 20 amp pool pump breaker. The current draw on that heater is minimal.
    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: New Heater Installation - separate breaker?

    Thanks for the help folks!
    16 x 42 x 24 IG Vinyl True-L, 27,000 gallons, full width steel steps, 8' Cuddle cove swimout, 2 X Colorlogic 4.0 LEDs, Hayward Tristar 1 hp 2-speed pump, Hayward SwimClear C3025 Cartridge filter, Hayward Aqua-Plus PL-PLUS Controls + Chlorination, Hayward low-Nox 400K BTU heater, Tigershark QC, TF-100 test kit

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    Re: New Heater Installation - separate breaker?

    Quote Originally Posted by bk406 View Post
    I have the same heater jumped on the 20 amp pool pump breaker. The current draw on that heater is minimal.
    Sorry for the spam. Could you upload a pic of your install?
    16 x 42 x 24 IG Vinyl True-L, 27,000 gallons, full width steel steps, 8' Cuddle cove swimout, 2 X Colorlogic 4.0 LEDs, Hayward Tristar 1 hp 2-speed pump, Hayward SwimClear C3025 Cartridge filter, Hayward Aqua-Plus PL-PLUS Controls + Chlorination, Hayward low-Nox 400K BTU heater, Tigershark QC, TF-100 test kit

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    Re: New Heater Installation - separate breaker?

    Its nice to have it separate for troubleshooting purposes but it can be on the same one with no problem.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: New Heater Installation - separate breaker?

    Quote Originally Posted by BigJD View Post
    Sorry for the spam. Could you upload a pic of your install?
    I could, but not sure it would help you much. I have a Pentair Easy Touch that controls everything. My heater is set up for 240V. I have L1 and L2 for the heater coming off the load side of the filter pump relay so when the pump relay is on (i.e. pump is running), I have power to the heater.
    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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