On 3/29/2015 5:47 AM, email@example.com wrote:
They offer energy savings as you don't keep hot a 60 or 80 gallon tank
of hot water all the time. You just make what you need when you need it.
You offer a lot of advice considering you admit you know nothing about
them. Depending on size, the electrics run from 15 to 30 KW. That
means it can pull 125 amps of the 200 available on a decent sized unit.
That's true, but does not take the lifecycle cost of installation and operation
into account. Storage tank heat loss is far lower than most people realize.
Especially with the new insulation standards for heaters now being sold.
Tankless heaters cost more to purchase, more to install and require regular
maintenance. They also have their quirks in that they don't handle low flow
demand very well. They rarely make economic sense in a retrofit situation as
getting sufficient electrical or gas supply can be an issue.
They make a nice selling point for new construction since getting sufficient
electrical or gas service usually is minor at builkd time and the additional
cost is buried in the overall cost of the house. Not sure most people realize
they need to have scheduled service calls, but hey - the get the warm fuzzy
New tanks are very well insulated. A couple with the same indirect
fired 4o gallon tank that I have went on vacation for a week. They
turned the heat off when they left and forgot about it. Wife took a
shower, then husband took a shower and noticed at the end the water was
starting to get cold. Only then did they realize the heat was off for a
week. I'd say that is pretty good insulation.
oe night I came home and found my old tank type heater leaking, so i turned off the gas and water.
near 24 hours later i got a nice hot shower. the water in the tank was still hot..
the old tank held the heat well.
Pex, mabee - if they don't come up with something better in the
Tankless heaters - not very likely. In Europe, mabee. In florida,
possibly. In minnesota, or Alberta, not unless global warming
progresses a lot faster than expected.
Mabee many, but definitely not most When the water coming in can be in
the mid 30s to low 40s F getting water hot enough for a decent shower
would take 2 in series. Will take a lot more "tech advancing" - and
MOST houses don't have big enough gas or electrical service to handle
even one of the energy suckers.
On Tuesday, March 31, 2015 at 7:34:34 PM UTC-4, firstname.lastname@example.org wrote:
plus add FLOW. One person living alone not a biggie. enough flow to do one thing at a time.
now a busy home with 4 people living there, laundry going, perhaps 2 showers going at same time. add incoming low water temperature say in the 30s.
now a conventional tank normally always has some hot water. even in a power failure.
we had a 4 day power outage, it was nice to have hot showers available.....
imagine cold showers.
the only thing tankless do is elminate standby losses.....
with the new standards requiring better insulation etc, standby losses are reduced, and they werent large to begin with.
standby losses help heat your home in cold climates so they arent a big issue to begin with.
I upsized my tank a lot..... from a 30 gallon 3400 BTU tank. after a few larger tanks my current one is 75 gallon, 75,000 BTU.
I can get a nice hot shower while washing clothes, we have 2 washers and 2 dryers. all gas....
Have to wonder where you live that the incoming water temperature
is in the 30s. Given that the ground temperature below the
frost line generally hovers around the annual average temperature
for the area (e.g. 53 degrees in central wisconsin), it seems
that a supply temperature in the 30s would be unusual.
"Throughout most of the U.S., the temperature of the ground below the frost
line (about 3 to 5 feet below the surface) remains at a nearly constant
temperature, generally in the 45 ? -50? F range in northern latitudes,
and in the 50 ? -70 ? F range in the south."
Well, in Guelph Ontario there are still a couple hundred homes with
no water due to frozen lines. The water lines are over 4 feet down,
which in normal winters is below the frost line. This year it was not.
Incoming water here in Waterloo a couple weeks ago was 38F.. Not sure
what it is right now.
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