Which Bosch, the larger unit is made by Takagi, the small unit 110000
btu is a one bath unit. You need proper gas flow or full BTU will
never be reached, You need it tested while all gas apliances are on.
What is winter time water temp lows. You need to know gpm and temp
rise needed. I have the small Bosch , its great. Is this a single
person use or family, with a family savings may be zero. I am seeing a
5 yr payback single use. Look also at Rinnai with remote thermostat,
Takagi makes a condensing unit of 94% efficiency if you have the $
Remember the large 190000 btu unit will likely double your gas
requirements, in winter when incomming water is coldest and
everything is competing for gas you wont get full btu without a great
supply, My incomming water can go to 36f, I still never set the unit
on high but you need to research everything or risk cold showers in
Good points sir. Thank you for your input. As for the use it's for
family (3). Natural gas. As for other appliances; kitchen stove, floor
furnace, wall heater. The two heaters are usually used from 4am-7am.
Wood burning insert supplies most of the heat in our normally mild winters.
take a look at the initial pro install cost with gas line upgrade and
possibly flue upgrade.
the energy saved will never exceed the high upfront costs in thew
warrantied life of the heater, max 10 years.
traditional tanks today are highly efficent, with their foam
insulation. just go and feel a recent production tank it wouldnt be
hot to touch, standby losses are very low.
at low flow rates heater may not trip on or water may be scalding hot.
Are you trying for endless hot water or attempting to save energy?
realize in the winter standby losses go to help heat your home,
although in the summer they add to your AC load.
My last tank I went with a 50 gallong 75K BTU tank, it has more than
double the recovery of our old 40 gallon 34K tank, I would of gone 75
gallons except it wouldnt physically fit:(
the 50 gallon tank provides almost unlimited hot water here, and our
shower has the flow restrictor removed:)
Last year, I was considering a purchase of a tankless water heating
system but the price was extremely high in Canada. I almost made the
purchase until the salesman said to make sure that no one else in the
home turned on the hot water tap when I was having a shower. The
system couldn't provide enough hot water to two taps at the same
Since then, I have discovered an interesting method of making as much
hot water as you would like, very efficiently on demand. If you use
your favorite search engine with the search words, 'cavitation heater'
or 'hydrosonic pump', you will have witnessed the device that I am
talking about. These devices are not currently available for
residential use and there is a patent on the idea. I plan on making
such a device for my own personal use which theoretically should not
violate any of the patent laws. This device is purely mechanical and
only requires an ordinary household thermostat to control. The cost
of such a device is very low, if you have done what I have done and
started your own basement machine shop.
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