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The only type of tankless unit I am aware of for $250 installed are the
type that sit under a sink and supply a gallon or two of very hot water
for making instant coffee and the like.
I've three 190,000 BTU Takagi T-KD20 gas fired tankless heaters
installed in rental units, one in my house, as well as one much larger
commercial unit. In my area, installed with all required accessories,
they are around $2,100 each.
The 190K BTU units are fine for a 1 BR setup, they supply two draws
(for example a shower *and* a dishwasher or clothes washer) with 124F
water from a 38F input.
However, these water heaters were selected for these locations on the
basis of physical size and direct vent design, they are NOT "cost
effective" on the basis of operating cost alone compared to a
conventional gas fired tank type heaters.
As for electric tankless, even the larger units typically work out to
1/2 of that total output, I am not aware of any residential electric
unit that approaches the capacity of the gas-fired units. See for
example the notes on the limitations of this 240V/120A unit:
http://www.plumbingworld.com/wholehouseelectrictankless.html
Michael Thomas
Paragon Home Inspecton, LLC
Chicago, IL
mdtATparagonnspectsDOTcom
eight47-475-5668
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Re: tankless water heaters
