Itsy bitsy tankless water heater?
I saw a thread a while back about tankless water heaters.
How about this?. I only want to heat the hot water for one sink, in
the bathroom. I haven't the patience to wait until it's hot so I
always wash my hands or my face with cold water.
I don't mind wasting money for once, though I plan to install it myself.
So what sort of electric tankless water heater would you recommend for
one sink?. I hope it won't need more than 15 amps.
How many gallons a minute of hot water does a bathroom sink use?
(The shower/tub in the same bathroom, the other 1.5 baths, the washing
machine, the kitchen sink, and the laundry sink can just wait until the
water gets hot, like they do now. My half-bath/powder room off the
front hall is directly above the water heater, and it is such a pleasure
to have hot water almost immediately.)
On Tuesday, September 23, 2014 3:12:55 AM UTC-4, micky wrote:
I doubt 15 amps is going to get you anywhere. I have an electric kettle to
heat water in the kitchen for coffee, tea, etc. It's 1500W and it takes qu
ite a few minutes to heat just a liter of water to boiling. You don't have
to get nearly that hot, but you probably want a couple liters a minute min
flowing through there. Like Ed said, a small tank type might be better i
f you have room. But IDK about them either. I've had a couple of those in
stant hot water dispensers for the kitchen sink. They use a tank. They la
st about 3 years and then they fail, for one reason or another, including l
eaking tank. Also, like a regular tank type water heater, sediment builds
up and the water winds up not tasting good. Just like I wouldn't use water
from a tank water heater to drink, I decided those under sink units were a
bad idea. For a bathroom it would be OK, provided the units last.
On Tuesday, September 23, 2014 8:04:15 AM UTC-4, David L. Martel wrote:
I'm not sure a recirculator is less money either in installation cost
or operating costs compared to a small water heater for one sink. The
recirculator would have the advantage that it would get hot water to
everything in the bathroom, eg shower, too though.
I installed the Watts recirculator a couple of years ago. Works great
and not that difficult if you can do some light plumbing work. I bought
my unit from an Ebay seller (brand new) and saved about $80.
Pump unit (mfg by Grundfos - very quiet) mounts atop the water heater on
the output side. Simple bypass valve mounts under the sink in the
location (ideally) the furthest down line from the heater.
It has a timer which you can use to tailor the operational hours if you
wish or just leave it run 24/7.
Only downside I've found is that if you like to take a drink out of the
tap, you'll find you have to run the water a bit to get it cool. System
is a closed-loop and the only way to get the hot water to your sink is
to "bleed it off" onto the cold side.
Sure is nice to open the faucet and have hot water immediately though.
On Tue, 23 Sep 2014 08:04:15 -0400, "David L. Martel"
Doesn't recirculation mean having an added pipe that runs back to the
water heater? I could measure, rather than going by my eye, but I"m
pretty sure that the water supply to this bathroom goes up the wall
between the kitchen and dining room, but then runs horizontally for a
foot or two, betore going a foot or two up the wall between the
Also I'm *sure* that the water supply pipes to those bathrooms turn
vertical just above an I-beam that holds up the house. So even if it
is really a straight run to the second floor, the I-beam is in the way
if I want to run another pipe.
(I was very surprised to see an I-beam in residential construction
(townhouses) about 10" high by 3 or 4 inches wide. There are two of
them, running sideways, perpendicular to the joists and trusses. The
one in the basement family room is boxed in. The one in the laundry/
furnace room has everything showing, except the ends, which I guess rest
on the cinder block wall. (I thought cinder blocks could crumble?))
So running a return pipe would be a lot of work, far beyond my ability.
(The kitchen has cabinets, but (I guess I could cut a path up the dining
room wall, across the dining room ceiling those 2 feet.... and somehow
turn corners at both ends, and have someone else replaster, but.I'll
probably tear the house apart and not repair it. Can't I do under the
sink in one day?)
On 9/23/2014 9:53 AM, Unquestionably Confused wrote:
YES! Additional piping is required.
The traditional hot water recirculation system uses a
dedicated return line from the point of use located
farthest from the hot water tank back to the hot
TRADITIONAL, yes. Watts recirculator as I have and has been featured on
Ask This Old House in the past does NOT.
As I specifically mentioned the Watts system in both my posts...
let's not confuse the issue for the OP any further.
Still in doubt?
and here's the installation video
On Tuesday, September 23, 2014 9:53:01 AM UTC-4, Unquestionably Confused wrote:
As long as you're OK with putting tepid water that's been in the WH
into the cold supply line, where it will be used for cold water for
anything between the WH and the sink that he wants the instant hot
water at. Could be the kitchen sink is on the route. If he's not
OK with that, then he would need a separate return line.
I guess this is really what I had in mind.** Thanks.
My basement WH leaked after so many years, but it was on the basement
floor, and now I have a pan underneath with a pipe to the sump pump
sump. Will this some day leak its 4 gallons into my bathroom, through
the ceiling to the dining room?
And will it radiate heat? I"ve pretty much stopped using my AC -- only
8 days this summer where I even needed the big fan -- but I don't want
to add heat to the top floor either?
**After I posted the question I found a page that seemed to say a
tankless water heater for even one sink was more like 40 amps.
Go to Amazon and look at "Bosch GL2.5 Ariston 2-1/2-Gallon Point-of-Use
Indoor Electric Mini-Tank Water Heater". Or you could just install one of
the automatic circulation pumps to make sure that hot water is always there
when needed but to make this effective, the hot water line really needs to
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