Need to heat hot water

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My recommendation will be for a tankless propane heater. I can only get one 120V ckt out of the existing panel, by adding a twin breaker as need a 1" slot as it has to be AFCI.
 
petersonra said:
I like this idea. Plumb them in series and when you are not using the system to heat water for the tub shut off the the heater that sees the water first. That way you only use energy when you need it. Just turn it on an hour or so before you need it and it will be nice and warm for you. That way under normal circumstances cold water will just flow through the extra heater.
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By using five valves, they can be configured in either series or parallel depending on which valves are opened and closed

One advantage to that is that if one goes bad, it can be isolated from the other one so that they never have to be without water when the time comes to swap one out
 
I've seen 40- and 50-gallon shorties, but not short enough to fit into most crawl spaces.
I suppose you could install an array of maybe ten under-sink water heaters in a crawl space.
 
I just had a customer that was dead set on having an instantaneous water heater, it was going under a cabinet next to a sink. He bought a 3.5 kw 240 volt, well that might do it, he said the manufacturer claimed it could run three sinks. First thing he did was pull out the water saver in the faucet. Hooked it up, could only get hot water if the faucet was cracked at about 30% which is a stream smaller than a pencil. He is now wanting to take it out and put a small tank type under there! LOL!
 
oldsparky52 said:
I'm not arguing that you are correct or not, but that makes no sense. I would think that under the dwelling is one place that you really would want AFCI protection.
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Afci is for protection of the circuit not for protection of the individual, so why would it be needed in the crawl space.
 
One other option: does the jetted tub itself have a heater? Could you increase the wattage of that heater?

Fill the tub with tepid water (hot water from tank until it goes cold, then keep going until the tub is full) and continue to heat to the desired bathing temperature in the tub? No additional space needed for a larger tank or another tank, and no requirement for hot water at full tap flow rate.

-Jon
 
Dennis Alwon said:
Afci is for protection of the circuit not for protection of the individual, so why would it be needed in the crawl space.
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What supposedly starts the fires? Arcing, right? I would want any arcing under the house I live in to be detected. I or my smoke detector should pick up one in the wall, but under the floor I don't think so... until the fire was burning.

I have no AFCI protection in my house and the floor is concrete, so it's all hypothetical to me.
 
winnie said:
One other option: does the jetted tub itself have a heater? Could you increase the wattage of that heater?

Fill the tub with tepid water (hot water from tank until it goes cold, then keep going until the tub is full) and continue to heat to the desired bathing temperature in the tub? No additional space needed for a larger tank or another tank, and no requirement for hot water at full tap flow rate.

-Jon
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I don't know and will ask. Its a jetted walk in tub so it much bigger than most jetted tubs
My hottub uses the heat from the motor circ pump to heat the water, it can heat 1.5 deg per hour as its well insulated. It costs $5.00 a month to run
 
hillbilly1 said:
I just had a customer that was dead set on having an instantaneous water heater, it was going under a cabinet next to a sink. He bought a 3.5 kw 240 volt, well that might do it, he said the manufacturer claimed it could run three sinks. First thing he did was pull out the water saver in the faucet. Hooked it up, could only get hot water if the faucet was cracked at about 30% which is a stream smaller than a pencil. He is now wanting to take it out and put a small tank type under there! LOL!
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Exactly. With this big walk in tub, it fills from the water heater, maybe 50 gallons, and then takes hours to fill with the 3.5 kw heater.
I have asked my granddaughters family to get options from a plumber, they should know.
 
tom baker said:
I don't know and will ask. Its a jetted walk in tub so it much bigger than most jetted tubs
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Whoops. Forgot about the 'walk in' part. I assume this means some sort of door, enter when empty and then fill. Using the tub to heat the water with someone inside is not a great solution.

Jon
 
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