Portable electric water heater attached to house hot water line?


W

willshak

Just a little background.
I have a pool house that I installed a kitchen sink with hot and cold
water. The pool house is supplied with water by means of a pvc pipe
running underground to a sillcock about 30' away. The pvc pipe is
attached to the sillcock with a short piece of garden hose (all threaded
joints). Under the sink cabinet in the pool house I have a Titan (made
in Italy, bought at HD) 2.5 gal electric water heater to make the hot
water for the sink. The pvc supply pipe has a tee fitting with one side
going to the cold side of the sink and the other side going to the
heater and then to the hot water side of the sink. The sink drains into
a septic tank 20' away.
Every year in the late fall, I take the portable water heater out,
disconnect the garden hose connector, and drain the pvc pipe. I also
take the sink trap out. Over the NY winters, I store the heater in my
attached garage.

Now, for my question (finally!).
I have a half bath on the opposite side of the house from my propane
water heater. Everytime I need hot water there, I have to let the water
run for a few minutes before it gets hot.
Can I use that electric water heater under the 1/2 bathroom sink feeding
from the house's hot water line?
In other words, rather than having the cold water line going into the
heater, it would be getting the water from the house's hot water line. I
doubt whether we would ever use 2.5 gals of hot water at one time there,
so the hot water line coming going into the heater would probably never
be really hot.
This would be just for the winter months when the elec. heater is just
sitting idle in the garage.
I can't think of a logical reason not to do it, but maybe someone else
has done it, or knows why it shouldn't be done.
I may not install the heater anyway, but if I get ambitious (or really
pissed off waiting for hot water), I'd like to know beforehand.
 
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S

Speedy Jim

willshak said:
Just a little background.
I have a pool house that I installed a kitchen sink with hot and cold
water. The pool house is supplied with water by means of a pvc pipe
running underground to a sillcock about 30' away. The pvc pipe is
attached to the sillcock with a short piece of garden hose (all threaded
joints). Under the sink cabinet in the pool house I have a Titan (made
in Italy, bought at HD) 2.5 gal electric water heater to make the hot
water for the sink. The pvc supply pipe has a tee fitting with one side
going to the cold side of the sink and the other side going to the
heater and then to the hot water side of the sink. The sink drains into
a septic tank 20' away.
Every year in the late fall, I take the portable water heater out,
disconnect the garden hose connector, and drain the pvc pipe. I also
take the sink trap out. Over the NY winters, I store the heater in my
attached garage.

Now, for my question (finally!).
I have a half bath on the opposite side of the house from my propane
water heater. Everytime I need hot water there, I have to let the water
run for a few minutes before it gets hot.
Can I use that electric water heater under the 1/2 bathroom sink feeding
from the house's hot water line?
In other words, rather than having the cold water line going into the
heater, it would be getting the water from the house's hot water line. I
doubt whether we would ever use 2.5 gals of hot water at one time there,
so the hot water line coming going into the heater would probably never
be really hot.
This would be just for the winter months when the elec. heater is just
sitting idle in the garage.
I can't think of a logical reason not to do it, but maybe someone else
has done it, or knows why it shouldn't be done.
I may not install the heater anyway, but if I get ambitious (or really
pissed off waiting for hot water), I'd like to know beforehand.
Hmmmmmm I'll bet there won't be any energy/efficiency savings
(electric heat vs propane). I think I would be leery of any
temporary (hose) connections under line pressure in a finished
part of the house. I'd pass on this one...

Jim
 
W

willshak

Speedy said:
Hmmmmmm I'll bet there won't be any energy/efficiency savings
(electric heat vs propane). I think I would be leery of any
temporary (hose) connections under line pressure in a finished
part of the house. I'd pass on this one...

Jim
I'm not concerned about energy savings, just the waiting time for the
hot water to arrive from the house water heater. Besides, I'm wasting
electricity having the well pump replace the water running down the
drain while waiting for the hot water to show up at the faucet.
The water fittings under my 1/2 bath sink are connected to the faucets
with flex tubing. We're only talking about disturbing the hot water
tubing twice a year, which is the same frequency that I install and
remove the flex tubing under the pool house sink.
 
S

SQLit

willshak said:
Just a little background.
I have a pool house that I installed a kitchen sink with hot and cold
water. The pool house is supplied with water by means of a pvc pipe
running underground to a sillcock about 30' away. The pvc pipe is
attached to the sillcock with a short piece of garden hose (all threaded
joints). Under the sink cabinet in the pool house I have a Titan (made
in Italy, bought at HD) 2.5 gal electric water heater to make the hot
water for the sink. The pvc supply pipe has a tee fitting with one side
going to the cold side of the sink and the other side going to the
heater and then to the hot water side of the sink. The sink drains into
a septic tank 20' away.
Every year in the late fall, I take the portable water heater out,
disconnect the garden hose connector, and drain the pvc pipe. I also
take the sink trap out. Over the NY winters, I store the heater in my
attached garage.

Now, for my question (finally!).
I have a half bath on the opposite side of the house from my propane
water heater. Everytime I need hot water there, I have to let the water
run for a few minutes before it gets hot.
Can I use that electric water heater under the 1/2 bathroom sink feeding
from the house's hot water line?
In other words, rather than having the cold water line going into the
heater, it would be getting the water from the house's hot water line. I
doubt whether we would ever use 2.5 gals of hot water at one time there,
so the hot water line coming going into the heater would probably never
be really hot.
This would be just for the winter months when the elec. heater is just
sitting idle in the garage.
I can't think of a logical reason not to do it, but maybe someone else
has done it, or knows why it shouldn't be done.
I may not install the heater anyway, but if I get ambitious (or really
pissed off waiting for hot water), I'd like to know beforehand.
Check out REDITEMP. I had one and it worked well after I changed the
operating procedures. I removed the time clock and installed an icecube
timer set for 2.34 minutes. I would push an button on the wall like an door
bell. Then the pump would turn on. It sucked hot water and pushed back into
the cold side. The timer was set for the longest time I needed to get hot
water. There are lots of recalculating pumps out there that all do the
same.

As for the garden hose your asking for problems. You know garden hoses are
not really pressure rated, AND not for potable water. (drinking)
 
E

Edwin Pawlowski

willshak said:
Can I use that electric water heater under the 1/2 bathroom sink feeding
from the house's hot water line?
In other words, rather than having the cold water line going into the
heater, it would be getting the water from the house's hot water line. I
doubt whether we would ever use 2.5 gals of hot water at one time there,
so the hot water line coming going into the heater would probably never be
really hot.
It will work. We have a small heater like that in the breakroom at work.
It is fed by city water, but the pipes pass through the boiler room on the
way to the break room. We are feeding the hot water heater with water that
is sometimes probably hotter than the heater would heat it. Unlike you, we
have to let the cold water run for a time to get cold water.
Ed
 
W

willshak

SQLit said:
Check out REDITEMP. I had one and it worked well after I changed the
operating procedures. I removed the time clock and installed an icecube
timer set for 2.34 minutes. I would push an button on the wall like an door
bell. Then the pump would turn on. It sucked hot water and pushed back into
the cold side. The timer was set for the longest time I needed to get hot
water. There are lots of recalculating pumps out there that all do the
same.

As for the garden hose your asking for problems. You know garden hoses are
not really pressure rated, AND not for potable water. (drinking)
Thanks, but I wasn't really looking for other solutions. I was curious
about using what I already have in the manner I described.
 
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D

default

run for a few minutes before it gets hot.
Can I use that electric water heater under the 1/2 bathroom sink feeding
from the house's hot water line?
In other words, rather than having the cold water line going into the
heater, it would be getting the water from the house's hot water line. I
doubt whether we would ever use 2.5 gals of hot water at one time there,
If you use that little water, then I don't see what advantage using hot
water
for the supply to the electric gives you.
The water coming into the electric will be water that's been in the pipes,
and will therefore be cold. And the water coming out of the main heater
will just sit in the pipes cooling, so you're not saving any energy at the
electric, and you're wasting energy from the other (gas?) heater.

If it's just for the sink, why do you need hot water there, anyway?

--Goedjn
 
Joined
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I've had to hook up two 40gallen water heaters. For two washing machines from the line before.
Really as long as your not using more than that at a time. There really shouldn't be a problem.
 
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