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Tankless water heaters - Page 2

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Posted by ransley on February 7, 2009, 9:10 pm
On Feb 6, 10:18pm, "Malcolm \"Mal\" Reynolds"

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.

Posted by Malcolm \"Mal\" Reynolds on February 7, 2009, 9:59 pm


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.

Posted by ransley on February 7, 2009, 10:59 pm
 On Feb 7, 3:59pm, "Malcolm \"Mal\" Reynolds"

Solar is the way to go. Tankless gas is great but you have to learn
about it, I like tankless and wont go back to tank but I researched it
and planned the install. An electric tank is cheap and easy to
install, maybe do that until you research it all. I kept my electric
tank as a Tempering tank and its now a backup.

Posted by BobG on February 7, 2009, 10:14 pm
 Now solar hot water is even more efficient than gas or electric hot
water. You need a big tank to hold a lot of btus with a big family,
but since you dont have a lot of hot water demand, maybe an 80 gallon
tank would be enough?

Posted by Ron Rosenfeld on February 8, 2009, 1:40 am
 On Sat, 7 Feb 2009 21:59:13 +0000 (UTC), "Malcolm \"Mal\" Reynolds"

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

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