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    chh's Avatar
    chh Posts: 2, Reputation: 1
    New Member
     
    #1

    Jan 24, 2014, 06:26 PM
    Propane Regulator
    The project is to heat my spa with a Raypak 266K BTU propane heater by attaching 2 40# propane cylinders to it. I need a suggestion / recommendation for a regulator. I heard that I need a 13" wc regulator. No brand or model was recommended. Thank you.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Jan 24, 2014, 07:27 PM
    There are only a couple of regulator companies, Fisher and Marshall comes to mind.

    80# of propane will produce about 6.5 hours of burn at 266,000 BTU. Not enough capacity in my opinion.
    Propane characteristics referenced in this post:
    Characteristic Value
    Pounds per gallon of Liquid @ 60 degF 4.23
    Gallons per pound of Liquid @ 60 degF 0.236
    Formula C3H8
    Specific Gravity of Gas (air=1) 1.52
    Specific Gravity of Liquid @ 60 F (Water=1) 0.504
    BTU per Gallon of Gas @ 60 F 91,502
    BTU per lb. of Gas 21,548
    BTU per Cubic Foot of Gas @ 60 F 2,488
    Cubic Feet of Gas per Gallon of Liquid 36.38
    Gallons per Therm (1 Therm = 100,000 BTU) 1.1
    Gallons per MCF of Natural Gas (1 MCF = 1,000,000 BTU) 11
    Dr_Spa's Avatar
    Dr_Spa Posts: 101, Reputation: 13
    Junior Member
     
    #3

    Jan 26, 2014, 10:33 PM
    The output of an LPG tank is relative to the surface area of the liquid in the tank. Only so much propane can evaporate from a specific surface area. A 40# tank will ONLY output about 40.1 k btu's of propane per hour... at 60 degrees ambient air temperature (less output at lower temps). Hooking two tanks up in PARALLEL will only give you 80.2 k BTU's per hour. NO WHERE near enough to supply a 266K BTU heater. ANY regulator you try to use should freeze up solid in just a few minutes.

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