Tankless water heaters

[Malcolm \Mal\ Reynolds]

I know it's been discussed before, but are there any comments on which TWH
are best (gas)?

I only need a small one, approximately 4gpm. I know Paloma is usually
recommended, but I see Rheem has models made by Paloma and Noritz comes up
frequently as does Bosch.

 

[Malcolm \Mal\ Reynolds]

TW u

I have a 117000 btu Bosch , got it for 500 at menards. I got a 4 yr
payback off electric tank. It heats 38f incomming to hot to shower. So
it depends, how cold is winter water, is it ng, It sucks down gas so
you need a big supply. One person use or two. Whats your budget, what
do you have now. Chimney or direct vent, what goes in the chimney now.
Do you want ultimate efficency.

I'm buying a house with a broken electric tank. I'll mostly live alone.
I'd like one that is dependable. It will probably be in the garage so it
should be direct vent. I'd certainly like an efficiency as good or better
than average. I'm willing to spend more if the payback period is
reasonable. It will be NG and the input temperature should be around 50 or
more

 

[sno]

I'm buying a house with a broken electric tank. I'll mostly live alone.
I'd like one that is dependable. It will probably be in the garage so it
should be direct vent. I'd certainly like an efficiency as good or better
than average. I'm willing to spend more if the payback period is
reasonable. It will be NG and the input temperature should be around 50 or
more

Replace the tank....put the heater elements on a switch in the
house....turn it on about an hour before you want to wash dishes/take a
shower.....then turn it off....

hope helps...have fun.....sno

 

[Malcolm \Mal\ Reynolds]

[email protected]:






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I'm buying a house with a broken electric tank. I'll mostly live alone.
I'd like one that is dependable. It will probably be in the garage so it
should be direct vent. I'd certainly like an efficiency as good or better
than average. I'm willing to spend more if the payback period is
reasonable. It will be NG and the input temperature should be around 50

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more- Hide quoted text -

- Show quoted text -

If garage is colder than house its efficiency will be less, if it
freezes many will be ruined. Some come with freeze protection, but
what if it fails. Mine is a Bosch 117000 Btu, battery [2 D cell]
ignition. The basement is best and it can vent up a chimney. The
lowest efficency tankless is 82 EF, EF is how you rate water heaters.
www.energystar.gov lists all that are made. Electric is near 100%
efficient, maybe 95EF, It depends on your electric per Kwh cost, vs Ng
and doing a Btu cost comparison. In the midwest US Ng is now at least
40% cheaper. Ther are downsides to tankless you must adjust to, and
you are feeding more gas to it than many home heating units so you
cant guess on gas supply, it must be tested. 1 person you can save, I
saved maybe 10$ a month. Will you install it, do you have a manometer,
they are cheap.

Seeing as I'm not getting the all "warm and fuzzy" feeling about this, I'm
thinking that I'll get a gas water heater. There is no basement and the
outside temperature seldom gets to freezing.

The only other thing I would consider is getting a PV array with all of
those subsidies and then an electric water heater. I just don't have a way
of figuring the costs and payback of such a setup.

Thanks for your help.

 

[Malcolm \Mal\ Reynolds]

If you are thinking solar, solar hot water will be more efficient than
solar PV for generating hot water.
--ron

I was actually thinking that the array might generate enough "credit" to pay
for my total useage or near enough to make it interesting

 

[[email protected]]

If I were to generate our hot water by solar, there is no question that it
would be much less expensive to put in a solar hot water system, than it
would be to add enough PV to run an electric hot water heater.

That problem has been solved for a long time. Just put in two ponds, one
low and one high, and use hydropower when draining the high pond into the
low pond. This is a completely free solution, and will generate plenty of
electricity to run a water heater.

 

[Curly Surmudgeon]

===================================================== How much is
'plenty' again? Lets say one 'pond' 100m across and 1m deep.... about
300 m^3, and you have it up on a hill 10m high. potential energy is
mgh=300,000 kg x 9.8 x 10 or about 3 million joules. If your micro hydro
generator gives you 100watts, you have enough energy for 30000
seconds... 500 min.... 8 hrs. Use it wisely.

If that is your limit, a 10 meter rise and only one meter of water, then
true. Few would consider such an installation but it would work.

 

[Curly Surmudgeon]

Your solution is an excellent one, provided the upper pond fills by
itself, either through springs or a stream or even rain water. But if
you have to generate the power to fill the upper pond, which would be
the case, for example, at our home, the solution is no longer "free".
--ron

The original context was windpower to move the water uphill.

 

[[email protected]]

==============================================
You need an extra 2KW of solar that gets 4 hr of sun to refill the top
pond.

No, I'll use my excess windpower. That makes it free.

 

[Curly Surmudgeon]

In this particular NG, your message to which I replied was the first in
the thread. So any message you posted about having excess power
available to implement a pumped hydro system was not available to me.

Understood but recognize that you are replying to a troll who got spanked
in another thread and is now just polluting other topics.

 

[terryc]

That problem has been solved for a long time. Just put in two ponds, one
low and one high, and use hydropower when draining the high pond into the
low pond. This is a completely free solution, and will generate plenty of
electricity to run a water heater.

Lol, "two water tanks = unlimted electrical power".

Your entry for misinformation idiot* of the week is noted.

*It has to be weekly as we have some many survivalist.

 

[Curly Surmudgeon]

Lol, "two water tanks = unlimted electrical power".

Your entry for misinformation idiot* of the week is noted.

*It has to be weekly as we have some many survivalist.

"RED" is EskWIRED trolling under a new nym.

 

[amdx]

Your solution is an excellent one, provided the upper pond fills by

once they finish cloning those mastadons we'll just all have giant
tredmills hooked to generators. Problem solved.

Peta won't let that last very long!
Mike ;-)