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Using old electric water heater as tempering tank?

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Using old electric water heater as tempering tank? Steve 03-12-2008
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Posted by Joseph Meehan on March 12, 2008, 5:39 pm
I doubt if it is going to save you enough to bother.

If it did work, it would mean you would also be burning more wood or you
will have a colder basement, which could convert to a cooler home.

--
Joseph Meehan

Dia 's Muire duit



> I will probably be purchasing a new "energy star" electric hot water
> heater for my house in the not too distant future. I was wondering
> what the issues would be (good or bad) to gut out the old one, remove
> the insulation and pipe it just ahead of the new one to act as a
> tempering tank?? I also have a wood stove in the basement for heating
> the house and I would place the old heater tank close to the wood
> stove to add heat to the tank. I'm thinking I could preheat the water
> in the old tank up to about 100 degrees F overnight especially. Do
> others here think this could be a worthwhile project to do? Thanks
> for any input on this!
> Steve


AppliancePartsPros.com, Inc.
Posted by ransley on March 12, 2008, 7:48 pm
wrote:
> =A0 =A0 I doubt if it is going to save you enough to bother.
>
> =A0 =A0 If it did work, it would mean you would also be burning more wood =
or you
> will have a colder basement, which could convert to a cooler home.
>
> --
> Joseph Meehan
>
> =A0Dia 's Muire duit
>
>
>
>
>
> > I will probably be purchasing a new "energy star" electric hot water
> > heater for my house in the not too distant future. I was wondering
> > what the issues would be (good or bad) to gut out the old one, remove
> > the insulation and pipe it just ahead of the new one to act as a
> > tempering tank?? =A0I also have a wood stove in the basement for heating=

> > the house and I would place the old heater tank close to the wood
> > stove to add heat to the tank. =A0I'm thinking I could preheat the water=

> > in the old tank up to about 100 degrees F overnight especially. =A0Do
> > others here think this could be a worthwhile project to do? =A0Thanks
> > for any input on this!
> > Steve- Hide quoted text -
>
> - Show quoted text -

Any savings is an investment, and what will NG cost in 20 years? maybe
4x more, so it is worth it as plumbing will last 60 yrs + and payback
goes down, J.M. penny foolish as is America and most of the world.

Posted by Joseph Meehan on March 13, 2008, 7:50 am

> wrote:
>> I doubt if it is going to save you enough to bother.
>>
>> If it did work, it would mean you would also be burning more wood or you
>> will have a colder basement, which could convert to a cooler home.
>>
...
>
> Any savings is an investment, and what will NG cost in 20 years? maybe
> 4x more, so it is worth it as plumbing will last 60 yrs + and payback
> goes down, J.M. penny foolish as is America and most of the world.

Maybe, but then if that tank decides to leak some night in the next 60
years and does a couple hundred dollars of damage .....

--
Joseph Meehan

Dia 's Muire duit





Posted by on March 13, 2008, 9:21 am

> I doubt if it is going to save you enough to bother.

I'm sure it would, with an electric water heater.

> If it did work, it would mean you would also be burning more wood or
>you will have a colder basement, which could convert to a cooler home.

The ceiling could contain more pipes to make a greywater heat exchanger.


> I will probably be purchasing a new "energy star" electric hot water
> heater for my house in the not too distant future...

Nick


Posted by on March 12, 2008, 5:54 pm

>I will probably be purchasing a new "energy star" electric hot water
>heater for my house in the not too distant future. I was wondering
>what the issues would be (good or bad) to gut out the old one, remove
>the insulation and pipe it just ahead of the new one to act as a
>tempering tank?? I also have a wood stove in the basement for heating
>the house and I would place the old heater tank close to the wood
>stove to add heat to the tank.

Sounds good to me. An alternative is 3 or 4 10'x4" PVC pipes tucked up under
the joists, if they are exposed. You might use close nipples and rubber
washers as bulkhead fittings between them, with garden hose adapters
at the main inlet and outlet, like this, viewed in a fixed font:

---------------------------------------------------
|in out|
---------------------------------------------------
---------------------------------------------------
|out in|
---------------------------------------------------
---------------------------------------------------
|in out|
---------------------------------------------------
---------------------------------------------------
|out in|
---------------------------------------------------

The main outlet could connect to the water heater drain.

The pipes would hold about 220 pounds (26 gallons) of water with 40 ft^2
of surface. In slow-moving air with a 1.5 Btu/h-F film conductance,
RC = 220/(40x1.5) = 3.7 hours. After 4 hours in 100 F air, water
would warm from 55 to 100+(55-100)e^(-4h/3.7h) = 85 F. A foil
wrap around the pipes and insulation above them would help.

Nick


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