The only thing that tankless water heaters have proven about themselves
is that they are more expensive to buy and install vs conventional tank
heaters, more prone to needing repair (costly repair at that), and any
benefits in terms of cost-of-operation over conventional tanks are
overstated, illusionary, or outright lies.
To answer your question (and be able to argue the pro's and con's of
tankless vs conventional for your case) we need to know:
1) What is the coldest incoming water temperature in the winter for your
location? The colder your municipal water supply is, the more
substantial the heating plant needs to be (BTU's) for a tankless
system. Remember that in northern climates, substantial piping changes
need to be made to be able to deliver enough natural gas to a tankless
2) What is the composition of your household? A home with more young
people typically uses more hot water (for showers, baths, laundry,
kitchen, etc) than a household with older inhabitants. It would be hard
to justify the upfront costs of a tankless system in a household
composed of two people (married couple, etc) in their 50's or older, for
3) To some extent, the length of plumbing runs between the water heater
and the most-used fixtures (shower, wash basin, etc) and if these runs
are insulated. The dynamics of how often and how long you typically
have to "let the water run" to get hot water to the desired fixture can
impact the efficient operation of a tankless system.
One of the things to consider is the size of your incoming gas
line. I put in a Rheem tankless but didn't increase my incoming gas
line size. It's ok for my use.
My dishwasher and shower are the only things that need heated water.
I don't use them simultaneously. Bachelors get by easier than married
guys. Or so I hear.
Of course you must figure what your rate of flow should be to size your
tankless "cold" water heater. For natural gas I would recommend the Bosh
heater that has the built in water powered generator for the igniter and
electronic controls. It's a little paddle wheel inside a housing in the
unit that produces electricity whenever water flows so you will have hot
water even if the electrical power is off at your home. ^_^
(Amazon.com product link shortened)72001773&sr=8-2&keywords=Natural+Gas+Tankless+Water+Heater+Bosch+520+HN+NG
I think there were some tankless heaters that used batteries to
power the ignitors. Memory failure on which brand.
My spell check doesn't like igniter or ignitor. Ignightor? Nope.
Ignighter. Shucks, missed again.
Self powered tankless CAN NOT be power vent! They are limited to chimney venting
and the chimney must be large enough for the high BTUs of a tankless.
In parts of the country the cold wnter weather can reduce heating ability...
depending on incoming water temperature. using just a mall amount of hot water
may not be enough to turn on the tankless burner
OP is probably better off with ma high efficeny water heater lie a VERTEX.......
they have around 98% thermal efficency
In any case tankless might end up increasing your water heating costs:( have a
teenager? endless showers can cost big bucks for not only gas to heat mthe
water, but the water and sewage...
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