I'm going to be moving my hot water heater. I was thinking about maybe
going with a tankless hot water heater but I don't know of anyone who
has one. I searched this group and found many threads on them but not
much first hand information. I found a lot of messages from people
thinking about installing them. Threads from people who know someone
who has one. And messages from people who installed them.
Does anyone out there have one and use it for all of their hot water
needs (shower, tub, dishwasher, washing machine, etc)? If so how do
you like it? Is yours gas or electric? What climate are you in?
My plan is to use it for a 4 bedroom, 2 bath house with a dishwasher
and washing machine. I have a large tub that I will want to fill. The
climate is moderate. Not sure of the cities water temp is but it is
cool here all year round but never gets below freezing.
I bought a house in NY back in '91 and replaced a circa-1950 system a
Weil-McClain 104,000 BTU oil-fired boiler with a tankless coil for domestic
hot water. This was a 3 BR 1 bath house with a dishwasher. My wife and I
took showers 30 minutes apart. In the winter, the tankless was barely
adequate. A normal length shower usually required constant temperature
adjustments and sometimes ended with lukewarm water. The triple-aquastat
controller for the boiler would almost always shut down the circulators
trying to keep up. No combination of control settings seemed to work. Keep
in mind, this was a small house, about 1100 sq. ft. I oversized the boiler
in an attempt to prevent hot water issues.
I ended up installing a 50-gallon electric HWH and fed it from the tankless.
I also valved it so that I could run the HWH or the coil alone. Never had
any issues after that.
Consider a Boilermate, or similar hot water maker. On-demand hot water in a
cold climate is tough. Storage is key.
I'm wiring in some instant water heaters in a church and I havn't done all
the math but I think they are a pig in a poke.
I'm electrical and I have to re-arrange panels, add high current wires, and
hide big wires.
I think they lower plumber capital costs and increase electrical costs.
I think a well thought out and controlled hot water source would have been
If you want to use a tankless for a whole home you need to really watch the
output rating..We put in a Takagi TK-1 about four years ago, in a 2500 sq
foot home and love it..It can keep up with two showers at once with no
problem..Albeit they are a bit more expensive, it works..Plus the gas bill
went WAY down..With nobody home during the day, all that gas used to keep
the water hot in the standard tank was lost..We also opted for the optional
electronic thermostat which allows you to choose your output temp, just like
on your furnace..We put it on higher temp for dishwasher and laundry and
turn it down to 102 degrees for shower..No mixing in cold water..It's
Hope this helps! John
I put one in a 2300 sqft house about 4 months ago. I put in the Takagi TK-2
(gas). My wife and I just love it. I live in Atlanta, so the temperature
here is farily mild - but in the winters it does get below freezing. We
have a large jacuzzi tub that with our prior tanked water heater - it would
fill about halfway before the water really started being cool getting into
the tub. Now my wife can fill it completely with the same temeprature hot
water all the time.
We have taken a shower and run the washing machine at the same time. The
water is just as hot, the pressure just dropped. Now this was using the hot
setting on the washer. We do take showers back to back without any issue..
and two showers have run at the same time with no problem.
The only thing that kinda caught me a little unaware is the venting. You
have to use Stainless Venting which is EXPENSIVE. I live in a ranch and
think that I spen $300 on venting. a 2ft straight section of vent costs
around $30. If your heater is on an outside wall and can be vented
directly outside, then this is not an issue. There is also a company
called Rinnai that makes heaters that can sit directly outside.. so venting
is not an issue.
The nutshell. I love it. and any house that I move into I will probably do
A true dual use electric water heater with sufficent GPM rating and
temp rise needed for any Zone 7 area or lower will need a dedicated 200
amp service.. Im no electrician but adding 200 amp I think would
I know of someone that uses one of these in canada and he is very happy
with the unit. A 200amp service is sufficient for the water heater and
your house. The unit don't use full power all the time. It also has an
efficiency rating of 99.5%.
mark Ransley wrote:
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