The wife doesn't like the house being set at 55 degrees
so she (and the teen) take long showers, only leaving
the bathroom when the 50 gallon hotwater tank runs cold.
My propane hotwater heater is set to something like 135 degrees.
That means a lot of hot water is going down the drain.
I wonder - is there a calculation done on how much
energy it takes to heat 50 gallons of water with propane
versus how much energy it takes to heat a house by 5
degrees with propane?
Maybe it is cheaper to just heat the house more?
Well the water side is pretty easy -- it's 8.33 Btu/gal/F at 100%
efficiency. Assume the heater is closer to 70% or so, so that would be
12 Btu/gal/F. If inlet temp were 55F,
Now that depends on the house and we've no data at all...
Are any of the controls electronic? If so, set the temperature
to be lower at the time of day that they take their showers.
Make it less comfortable.
Or, expect them to be rational beings and not wasteful of
Depends on how big (small) the house AND how satisfied they
will be living with shorter showers in a SLIGHTLY warmer house!
We don't know *why* he keeps his house at 55 degrees! Perhaps
there are economic issues at play? When I was a kid, I'd catch hell
for opening the refrigerator and just standing there, "shopping":
"Close it until you've made up your mind".
The heat capacity of water is four times that of air.
That's on a weight basis and air is 784 times less dense than water.
You could do a rough calculation on this basis. You'd need the volume
of air in your house to make the comparison.
If your furnace is a 90 percenter, most likely cheaper
to use the furnace. Most WH are about 70% efficient.
From here, the big expense is the 50 plus gal of warm
water that go down the drain.
As to the WH, it takes one BTU to raise one pound of
water one degree F. So, you can measure the temp of cold,
temp of hot, and get the temp rise the WH provides.
You can run the furnace some morning, see how long it
runs to warm up the house. Look at the BTUH rating of
Whoa! Water temp. is at 135 deg and indoor temp. at 55 deg.?
If I keep temp. like that I'd have revolt from all member of
my family. That is barely ~14.5C. If OP has to keep it that way
how about changing shower head to water saving type? Any one in
the family catching cold? 135 deg. is lower than that of some hot
springs in the Rockies.
According to the West Midlands Public Health Observatory an
adequate level of wintertime warmth is 21 °C (70 °F) for a living
room, and a minimum of 18 °C (64 °F) for other occupied rooms, giving
24 °C (75 °F) as a maximum comfortable room temperature for sedentary
adults. At temperatures below 20 °C (68 °F), increased risk of
death has been observed, and winter deaths reportedly rise at a rate
of about 1.4% per degree below 18 °C (64 °F).
Why the wife doesn't just turn up the thermostat is a mystery.
Yeah, I don't have to do the math.
Most of the heat put in the water leaves by way of the drain.
So, is it you trying to force your family to live at 55?
That's just cruel.
Eskimo Igloo may be warmer than 55 deg., LOL!
Our thermostat is programmed at 20.5C and 18.0C.
When we're away on vacation, at 14.5C all the time
in winter, 23.5C in summer. Any how I can remotely
adjust the settings any time any where if there is
Our bill includes power, gas, water(tap water, sewer service), garbage
pick up(waste, recyclable), snow removal on the walking path in the
park. ~400.00 CAD in the winter. Your gas pump price is lower than ours.
Right now 1.25 CAD/Litre for 91 Octane gasoline which my car needs.
There are two known cases of minor quakes due to fracking, one in
Northern B.C., one in Northern Alberta. Fracking co, is hurting too
because of low price of oil...
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