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Old 12-27-2013, 08:45 AM   #16
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Hybrid water heater advice


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Originally Posted by beenthere View Post
When your thermostat calls for heat. You will still get as much hot water as you need. Since in order for a steam boiler to heat your house. It has to increase the water temp in the boiler to make steam.

A superstore on a oil fired steam boiler is a bad idea. Only uses slightly less oil. And the superstore cost so much that you never get a return on your investment.
The cost is exactly what I was getting at......so your thoughts are the hybrid type unit as well? Kinda hard to pass up with all the tax & reimbursement advantages going on.....

Right now in my current home I have a Rannai "on demand" system fired from LP.....does the job. However they don't give LP away either.....

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Old 12-27-2013, 10:54 AM   #17
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Hybrid water heater advice


Doing some math, the hybrid water heater should cut the cost of heating water by about half.
If your Rinnai is in good shape, you might be able to sell it for $400 on Craigslist. You still should think about keeping the tankless in the loop though. If your family routinely uses up all the hot water stored in the tank, it will have to switch over to normal electric heat mode to keep up. With the tankless still in the loop, you could set the hybrid to Heat Pump Only mode. The tankless would only kick in when the tank runs out. It takes about 4 hours to heat the tank in Heat Pump Only mode so if people are taking back to back showers, your tank will run out.

FYI, I don't know where you are located so I calculated the 50% number based on West Michigan prices.
0.82 energy factor for the Rinnai tankless
$2.50/gallon for LP
2.4 energy factor for the hybrid tank
$.15/Kwh for electricity
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Old 12-27-2013, 03:49 PM   #18
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Hybrid water heater advice


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Originally Posted by chiraldude View Post
Doing some math, the hybrid water heater should cut the cost of heating water by about half.
If your Rinnai is in good shape, you might be able to sell it for $400 on Craigslist. You still should think about keeping the tankless in the loop though. If your family routinely uses up all the hot water stored in the tank, it will have to switch over to normal electric heat mode to keep up. With the tankless still in the loop, you could set the hybrid to Heat Pump Only mode. The tankless would only kick in when the tank runs out. It takes about 4 hours to heat the tank in Heat Pump Only mode so if people are taking back to back showers, your tank will run out.

FYI, I don't know where you are located so I calculated the 50% number based on West Michigan prices.
0.82 energy factor for the Rinnai tankless
$2.50/gallon for LP
2.4 energy factor for the hybrid tank
$.15/Kwh for electricity

Maintaining temp in a steam boiler in case the heat pump can't provide enough hot water, is real expensive. Cost a lot more then the electric element will cost to heat the water every so often.
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Old 12-27-2013, 05:16 PM   #19
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Hybrid water heater advice


I think I missed something. Sounds like you have 2 houses? One has the Rinnai tankless and the other has the steam boiler? I was assuming it was 1 house with a Rinnai tankless AND a steam boiler.
I would agree that heating water with steam in a single family house makes no sense.
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Old 12-29-2013, 08:24 AM   #20
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sorry, I purchased an older farm home with a steam boiler. I currently have a condo with the Rannai system running from LP......

I have decided to go with the hybrid unit......just doesn't make sense to spend all kinds of cash to make hot water with an oil boiler system......

Unfortunately the electric company where the new home is located is on the high side as far as rates go so the savings won't be as great as others.....
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Old 12-29-2013, 08:39 AM   #21
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An old steam boiler isn't real efficient, so you will still see a large savings. Make sure to disable the aquastat that keeps your boiler hot for DHW, after you have the new water heater in.
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Old 02-05-2014, 01:43 PM   #22
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beenthere, how can I tell which wire to disconnect? I can get a picture if that helps??

OK went to the local plumbing supply house the 50 gallon hybrid is not going to supply enough hot water for our projected usage therefore will not be efficient The 80 gallon hybrid is 3X the price of the 50. The salesaman suggested the Whirlpool "energy smart" which is an 80 gallon enerygy efficient unit but NOT a heat pump style unit.

I don't have the coin to pony up for a 3K hybrid hot water heater. Any suggestions?? hook two 50's in series with each other??? Running out of options

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Old 02-05-2014, 04:21 PM   #23
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Would need pics of all the controls on the boiler to tell you.

Many hybirds can also switch back to an electric element on those times the heat pump can't keep up. While not as efficient as the heat pump doing all the work, its still less then a resistance only water heater.
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Old 02-05-2014, 04:29 PM   #24
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Yeah, I noticed that as well. Going from 50 gal to 80 triples the price but getting 2 50s only doubles it. Definitely worth considering. Maybe set the first one to heat pump only mode and 80-90 degrees then set the second one to 120 degrees in hybrid mode? Would need enough square feet for 2. Probably a second 240V circuit would be needed. Theoretically, if you put them both into heat pump only mode, 1 circuit would do because they would only draw 3 Amps each. I don't recommend it but it is an option.

Have you considered the Rheem hybrid? It's $1200 but the heat pump heats 20% faster. Maybe 1 GE and 1 Rheem?

Last edited by chiraldude; 02-05-2014 at 04:32 PM.
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Old 02-06-2014, 04:19 PM   #25
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Originally Posted by chiraldude View Post
Yeah, I noticed that as well. Going from 50 gal to 80 triples the price but getting 2 50s only doubles it. Definitely worth considering. Maybe set the first one to heat pump only mode and 80-90 degrees then set the second one to 120 degrees in hybrid mode? Would need enough square feet for 2. Probably a second 240V circuit would be needed. Theoretically, if you put them both into heat pump only mode, 1 circuit would do because they would only draw 3 Amps each. I don't recommend it but it is an option.

Have you considered the Rheem hybrid? It's $1200 but the heat pump heats 20% faster. Maybe 1 GE and 1 Rheem?
I'll look into that unit chiraldude. The salesman talked me out of the 80 gallon hybrid he said the return will take years, and most likely they will drop in price in the near future

Heating hot water with oil now tankless.....anything is cheaper

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