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Thread: What size water heater needed for Jacuzzi?

  1. #1
    DIY Junior Member wrdrennan's Avatar
    Join Date
    Apr 2012
    Shoreline, WA

    Default What size water heater needed for Jacuzzi?

    I plan to install a 55-gal jacuzzi tub. What size water heater do I need, gas, tank?
    4 people in the house, 1 bath, might add 3/4 bath in 5-10 years. I'm thinking 75-gal, but that might be over kill. Maybe 65 would cut it fine?
    Last edited by wrdrennan; 04-27-2012 at 10:37 AM.

  2. #2
    In the trades Dana's Avatar
    Join Date
    Jan 2009


    With a condensing gas water heater w/~75KBTU/hr burner you should be able to get there with a 50 gallon. For non-condensing burner (any rating), 65 works, but if it has less than 50KBTU/hr burner you might have to wait for it to recover after filling the tub before somebody in as-yet built second bath could take a shower.

    If you wanted margin, the 100KBTU/hr burner version of the condensing 50 gallon Vertex has a higher first-hour gallons rating than most 75 gallon tanks. You may have subsidies available to you for going with a condensing water heater too. A 100K condensing burner can run ~3gpm (about 1.5-2 low-flow showers) of 110F water forever at typical Seattle area incoming water temps.

  3. #3
    DIY Junior Member imeot's Avatar
    Join Date
    Dec 2011


    Hi, based on my humble opinion for a jacuzzi I'd use a tankless water heater. That way you could get on-demand hot water whenever you need. Since you have a relatively large house I'd think about buying a high-end tankless water heater. Probably the Rinnai tankless water heater - R94/RL94 (and above) would be a safe bet, such a heater could handle all the prerequisities you set up in the opening post. And last but not the least the extra price you pay for a tankless water heater will return as a saving on a longer run.

  4. #4
    DIY Junior Member BrianK's Avatar
    Join Date
    Jun 2012
    Calgary, Alberta, Canada


    You could also install a second 40 gallon tank in series with your other tank. I did that and we have lots of water. The nice thing about 2 tanks is that if one goes, and if you installed bypass valves, you will still have hot water and you have some time to replace the failed tank.

  5. #5
    General Engineering Contractor ballvalve's Avatar
    Join Date
    Dec 2009
    northfork, california


    2 cheap forty's. Always best to design with backup, and can turn one off when the JAQ is out of service or you go away.

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