We have had great luck with our envirotech unit and use it for hydronic
heating and hot water. We adjust the temp when we use it for a shower or
need a lower temp. In the summer we keep it at a low temp 85deg and turn it
up when we need hotter water. We have saved over 20% compared to our gas
unit. I also live in the northeast and these units can heat 30deg water hot
enough for a shower and even hotter than you can stand for washing dishes.
Only reason people don't like them is the high amp rating of the heater
scares them away. Mine is 120amps. Also they are easy to install if there
is an electrical panel close by it can be installed in less than an hour.
Plumbers can't make much on an hour of work. And they last longer so they
won't be replacing it too soon so that also makes plumbers profit go down.
Some people with really hard water or other water problems need a new heater
every few years. This unit won't leak guaranteed and the stainless steel
elements will last a long time. Let me know if your interested I can get
you a deal on one

Robert Rolleston
518-260-5934

"Robert11" wrote in message
...
Hello:

Have been looking at homes lately, and find that many are using
tankless water heaters for supplying the hot water faucets in the home.

Know nothing about how these works, or their pros and cons.

I can figure out how the electric models work, I think, but how
do the gas and oil ones operate ?

I had a very old house once that had a tankless water heater on the
regular
home furnace. I'm not sure if the heat from the furnace, or some of the
water
used for the forced hot water heating system was on the primary side of
this
heat exchanger.
Just out of curiosity which was most likely ?

a. Any explanations on how my old one probably functioned, and how the
new
ones do now would be most appreciated.

b. are they generally considered to be cheaper to operate than the stand
alone tank types (I live in the Northeast) ?

c. are they very popular these days ?

d. pros and cons ?

Much thanks,
Bob