Supplemental Water Heater?

I just had a new Jacuzzi installed as part of a bathroom remodel and find that my 50 gallon hot water heater does not have sufficient capacity to fill it with hot water so I am looking for possible solutions. The current gas hot water heater is only two-years old and, except for the jacuzzi, provides plenty of hot water for my wife and me so I am reluctant to just replace it. The other thing to factor in is that we had a recirculating pump in the line to the bathroom because it is a long run from the hot water heater and took a very long time to get hot water up there. Now it is instant. The reason I mention this is that I understand that supplemental units usually turn on when there is water flow in the line and I would not like to have a supplemental unit running all the time.
Are there supplemental heating units that would work in this situation? Perhaps ones that turn on only when the temperature in the line drops below a set limit?
Any help or suggestions for making this work would be greatly appreciated. I know that I could just replace the current unit with an 80 gallon tank but that seems a waste of money and energy since the Jacuzzi will not be used a lot.
Thanks in advance - Joel
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On Jan 15, 10:35 am, snipped-for-privacy@gmail.com wrote:

Joe-
BTDT, hopefully my experience will be of some use to you.
I have a one person jacuzzi tub (~50 gallon to fill to usable level) in a master bath as well, 75 gallon propane fired water heater. Most of the time when the tub is used, the cold water coming into the house is a bone chilling 40 to 45 deg.
When I first started the using the tub, I'd adjust the temp of the water coming into the tub to a comfortable level and then let the tub fill.
Well by the time the tub was about 75% filled to a usable level, the water coming into the tub was no longer hot enough.......nor was the "hot" water. The cold water coming into the water heater had brought the "hot water" temp down to "luke warm". :(
The modified fill procedure is ....fill with hot water only, to about 75% full.....adjust temp at the end.
Works fine but gotta start with a "fresh" load of hot water, no recent showers, dishwasher or washing machine usage.
What is the capacity of the tub? If its ~50 gallons, my "hot water" fill trick should work. If the capacity is much larger maybe not.
Another trick (but requires a little planning) is to boost the water heater set temp an hour before tub time.
hth
cheers Bob
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I saw a trick a few years ago that might work here. The person had used a couple 10' lengths of 4-inch PCV as a 'storage tank' on the inlet side of their water heater. The 1/2 line feed into one end, and out the other to the tank. Supposedly the water stored in these was warmed several degrees (by the house heat of course), reducing the recovery time on the heater. I suppose any kind of storage tank could be used in this case, but the pipes were strapped to the basement ceiling out of the way.

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well you have some options..........
set the existing tank at max and add a tempering valve, that will automatically mix hot and cold water to limit the maximum temperature so no one gets scalded,
you can test this approach set tank as hot as it will go, wait till the tank is hot burner off, then fill tub
if you can fill tub successfully your all set but add the tempering valve so no one gets burned.
or add a large high capacity tankless as a preheater , tankless first.
the water must be heated anyway, so preheating costs little beyond the upfront costs.
the tempering valve is the most affordable approach
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