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Alternative Fuels An energy source alternative to using fossil fuels. Materials or substances that can be used as a fuel, other than conventional fuels. Waste oils, vegetable oils or animal fats, which can be used alone, or blended with fossil fuels.

Alternative Fuels

hybrid water heater


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  #1  
Old 01-25-2014, 10:29:30 PM
Ken Karrow Ken Karrow is offline
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Question hybrid water heater

Can anyone punch a hole in my logic on this. I am now in west central Missouri. I have an electric water heater and considering replaceing it with a hybred which is a water heater that has a heat pump on it that heats the water and cools the air in the house. It can be set to run heat pump only, electric resistance only, or heat pump with electric resistance backup if the useage is high. I can normally buy propane for $1.65 by buying the whole years supply in the summer and having it delivered as needed and my electric is $.12/KWH. With the heat pump having a COP of 2.5, in the heating season, 1,000,000 btu of hot water would be $14.65 for the heat pump and $20.07 for propane for the 90% furnace to heat the cool air produced by the heat pump. That totals $34.92. The water heater on straight electric is $35.17/1,000,000 BTU. During the cooling season my hot water would be free because the cooling effect of the heat pump would cause the air conditioner to run that much less. I have ignored the heat thrown off by the compressor feeling that would roughly balance, helping in the heating season and extra heat load during the cooling season. If we had an exceptional winter and propane got real dear or I quess wrong on how much to buy in the summer, I could just run it like an electric in the late winter. Therefore is no advantage in the winter on operating cost but a large advantage in summer. Another advantage is the need for a smaller back up generator. Am listening for any flaws in my thinking. PS existing water heater is seven years old.
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Old 01-26-2014, 08:45:09 AM
Ed Radtke Ed Radtke is offline
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Default Re: hybred water heater

Did you factor in repair cost and eventual replacement cost.the fancier it is the quicker it will bite you in the ...
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Old 01-26-2014, 04:33:22 PM
BobRR BobRR is offline
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Default Re: hybred water heater

I agree with Ed and a FYI a standard electric water heater will last 30yrs. Bob
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Old 01-26-2014, 09:44:13 PM
RSCurtis RSCurtis is offline
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Default Re: hybrid water heater

There are no flaws in your thinking. For the time you can run the heat pump, the cost will be about half required for a resistance unit. Keep in mind you will have to deal with the condensate from the refrigeration unit. The only time I could see it not paying off is if your climate requires extended use of resistance heat. It will be most efficient in hot, humid weather, just when you want the air conditioning.

If not terribly expensive, I would consider an extended warranty. You don't want to know how I know that.
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Old 01-26-2014, 10:27:00 PM
Ken Karrow Ken Karrow is offline
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Default Re: hybrid water heater

Thanks for the replies. Missouri does get hot and humid and I have done refrigeration repair since 1966 so I can repair lots of it myself, though electronic boards are intiminating but now you just grit your teeth and buy a new one. Bob, I don't know how the water here is on tanks but I've never had a tank last over 10 years before it rusts out. They may last better here.
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Old 01-27-2014, 02:18:13 PM
Bob Willman Bob Willman is offline
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Default Re: hybrid water heater

The hybrid heater requires a minimum size room to house it - you cannot install it in a closet. We replaced a gas heater last year and looked at the hybrid. There are several brands. Do a search on hybrid heaters and read the reviews. After reading many reviews I decided the technology was not quite ready for prime time.

Bob
WB8NQW
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Old 01-27-2014, 03:19:19 PM
BobRR BobRR is offline
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Default Re: hybrid water heater

Ken was it a gas or electric that lasted 10yrs? Average life of gas is about 10yrs. Bob
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Old 01-27-2014, 05:23:52 PM
Wayne 440 Wayne 440 is online now
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Default Re: hybrid water heater

Why not a propane water heater? Maybe even an on demand type?
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Old 01-27-2014, 10:53:12 PM
Ken Karrow Ken Karrow is offline
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Default Re: hybrid water heater

Bob & Bob - have a room, sits in utility room and they were gas water heaters. Wayne - due to roof configuration if I go propane I'll need to go to fan forced vent so I can vent through wall. Thanks for the interest.
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Old 01-28-2014, 12:38:37 AM
Ed Sparks Ed Sparks is offline
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Default Re: hybrid water heater

power venter or high efficiency propane water heater that vents through PVC exhaust.
Both are viable options.
I have a power venter on my 20 yr old propane bradford white water heater. much less expense than a chimney.

When it goes it will get replaced with a propane on demand Rinnai water heater.


climate has a lot to do with their efficiency.
They don't work very well up here in Maine.
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