on demand electric water heater

G

gcroix

Jan 1, 1970
0
Hello all,

I'm not sure this is the right newsgroup, but I'll give it a shot. I
currently have a small electic run of the mill water heater. I'm thinking
of replacing it (output is starting to decline) with a electric 'on demand'
water heater. Has anyone out there done this, or do you have one? I have
questions about where to place it (concerning distance from breaker box),
and whether to buy one for each sink, or to buy one for the whole house.

Thanks in advance,

Gary C in EC, NC
 
M

m Ransley

Jan 1, 1970
0
On demand take alot of power, A Bosch whole house unit needs 120 amp
dedicated. For me Gas is the only way, im in the midwest and
electricity is 3x the cost of gas.
 
M

Mel

Jan 1, 1970
0
gcroix a écrit :
Hello all,

I'm not sure this is the right newsgroup, but I'll give it a shot. I
currently have a small electic run of the mill water heater. I'm thinking
of replacing it (output is starting to decline) with a electric 'on demand'
water heater. Has anyone out there done this, or do you have one? I have
questions about where to place it (concerning distance from breaker box),
and whether to buy one for each sink, or to buy one for the whole house.

Thanks in advance,

Gary C in EC, NC
Click to expand...

I've lived in houses with on demand hot water before, and I would rather
shower cold than use one again. Uncomfortable.



Mel
 
M

m Ransley

Jan 1, 1970
0
Modern electronicaly controled Tankless are great Ive had one 2 yrs No
complaints from anyone.
 
M

m Ransley

Jan 1, 1970
0
I had a good electric tank Rheem 3 yrs old. I was paying 30- 40$ a
month at .125 kwh for it . I put in a Bosch Aquastar pilotless Battery
ignition 117000 BTU Ng unit keeping the electric tank as a Pre tempering
tank. Costs to do 5 loads of laundry , cook 3 meals a day and HW now is
6-7 $ a month in summer. I pay apx 1$ a therm. Payback is very short
for this unit. I agree electricity for 99% of the US is not the smart
way to go on Kwh vs Ng comparison costs. Plus the 120 Amp Bosch may
require you upgrqading your service. Rinnai has higher efficiency than
Bosch or Takagi. Rinnai is worth a serious look for Gas tankless.
 
M

m Ransley

Jan 1, 1970
0
Look into Rinnai gas tankless. I believe they are apx 5% more efficient.
Bosch and Takagi run 82-83%
 
M

m Ransley

Jan 1, 1970
0
I was not clear or correct on an earlier post , I have a Bosch tankless
Gas, but have heard their Electric tankless operates with the same
quality as gas. The electric tankless needs 120 Amp dedicated. Truely a
hog. My electric is 3x the cost of Ng so I would never consider it as
few should that have higher electric costs. If I was to do it again Id
look into Rinnai as its efficiency is higher other than that the Bosch
gas works great and needs no AC line as it is Battery ignition,
Batteries are on their second year and recently tested good, 2 regular D
cell.
 
L

Luv Hobitses

Jan 1, 1970
0
gcroix a =E9crit :

I've lived in houses with on demand hot water before, and I would rather =

shower cold than use one again. Uncomfortable.
Click to expand...


Why? What were your objections? The delivered temp of
the water? Volume? Power and $$$ consumption?
 
M

Mel

Jan 1, 1970
0
Luv Hobitses a écrit :
Why? What were your objections? The delivered temp of
the water? Volume? Power and $$$ consumption?
Click to expand...


Well, it may be because it was a rented house and the hot water system
ws crap but:

The temperature was unstable and would cycle cold warm hot cold warm hot
with a complete cycle in about 4 minutes. This meant getting under the
water only when it was on the warm phase - to avoid freezing or getting
burnt.


The other place I lived in with on demand hot water was uncomfortable
because it cycled (not as drastically) but also becasue it made a lot of
noise - so if someone else had to get up early, you ended up being woken
up as well.


Maybe I was just unlucky?



Mel
 
M

m Ransley

Jan 1, 1970
0
Mel you had 2 units in need of repair or 2 cheap units. That can happen
in rentals, you should have demanded a repair - remedy. My Gas goes
from 1/2 gal - 5 gpm with no temp change and electrics I have tried the
same. There is more to break on a tankless, but they save allot of
energy.
 
M

Mel

Jan 1, 1970
0
m Ransley a écrit :
Mel you had 2 units in need of repair or 2 cheap units. That can happen
in rentals, you should have demanded a repair - remedy. My Gas goes
from 1/2 gal - 5 gpm with no temp change and electrics I have tried the
same. There is more to break on a tankless, but they save allot of
energy.
Click to expand...


I guess I didn't know enough to know that the units we had were broken
or cheap - I just thought they were all like that!

Of course, it wouldn't have been a problem if we took baths, and it
wasn't to hard to do the dishes...

Mel
 
G

Gene S. Berkowitz

Jan 1, 1970
0
Hello all,

I'm not sure this is the right newsgroup, but I'll give it a shot. I
currently have a small electic run of the mill water heater. I'm thinking
of replacing it (output is starting to decline) with a electric 'on demand'
water heater. Has anyone out there done this, or do you have one? I have
questions about where to place it (concerning distance from breaker box),
and whether to buy one for each sink, or to buy one for the whole house.

Thanks in advance,

Gary C in EC, NC
Click to expand...


Before replacing the HWH, have you performed any basic maintenance?
Have you flushed it to remove crud? Does the sacrificial anode still
exist? Do you have hard water? Scale buildup on the elements acts as
an insulator, and replacement elements are cheap and easy to install.

--Gene
 
M

Me

Jan 1, 1970
0
Gymmie Bob said:
Correction. Electric hot water heaters do not get inefficient. They can get
gummed up and be slow to reheat water but the heat has no other place to go
but into the water. They can develop electrical grounds in the tank but it
usually ends up heating the water anyway.
Click to expand...


Geez, what a DUFUS, Anyone with a gradeschool education knows that the
heat also goes into the surrounding air as well. Any heat lost to the
surrounding enviorment is considered a loss term in the efficincy of the
water heater.


Me who knows a morooon, when I read one........
 
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