I'm from the US and I was shocked they needed 400A plus propane. We draw more current then you guys because our voltage is lower but still, 200A services are pretty standard for large rural homes.
Seconded. I recently completed an all electric high performance remodel, and with 200A service, I can power a heat pump, heat pump water heater, all electric kitchen and laundry, and an EV charger, with Amps to spare. This is in the mild Bay Area, and my heat pump draws about 6A (15A breaker). The largest loads are EV and cooktop/stove.
A 3000sqft custom house built to high performance standards (airtight and well insulated) can be space heated in a cold climate with a heat pump that draws no more than 24A (40A breaker) using a heat pump. At that load a modern heat pump will make 40kBTU of heat. There are many examples of this across Canada.
I just now read that they have an outdoor heated pool, though, so crazy as it sounds they are presumably using electricity to heat it.
> plus propane.
Apart from backup water heating when the power goes out, their hot tub will waste huge amounts of energy, so propane might be operationally cheaper than electricity.
Edit: Service in the US is generally 200A or 400A. I'd say 400A is overbuilt for what they have, but that doesn't mean they actually use much of that capacity.
For example, I average 1000 kWh per month, which is about 1.39 kW 24/7, or 12 amps average on my 200A service. The 200A is to have headroom for peak demands, and we probably never get close to 200A.
If I were to rewire my panel (it's full), I'd go for the 400A - it's just heavier copper in the three lines to the entrance panel. That would not increase my monthly power bill right now, but it would provide lots of excess capacity in case I want to switch to heat pumps and electric vehicles.
Since we heat with wood and propane and don't use electricity for either and have mostly LED lighting and a gas stove, I do wonder where all the power is going, especially at night. Too many computers, I guess. Add analysis to my to-do list!
Assuming you are using are using a resistance heater (100% heating efficiency), to raise 200Gal of water (typical small hot tub size) from 50F to 100F requires about 25kWh of energy.
To only use 75kWh/month (255kBTU), you would need to only raise it to 100F less than 3 times a month, and that assumes that the water temp doesn't naturally drop below 50F (unlikely in NH).
It's likely you are spending significantly more than $15/month to heat it with electricity.
Propane is about $30/MBTU, which would work out to about $9/month for the equivalent amount of heat.
1. https://www.electricrate.com/residential-rates/new-hampshire...
2. https://bloglocation.com/art/water-heating-calculator-for-ti...
The tub is well insulated, with an insulated cover, so you need to account for that. My estimate on the hot tub cost is by comparing my kWh usage after the tub was installed to the prior year use.
Most small tubs are electric, like mine.
So assuming $15/month, you are using 115kWh, which is 392kBTU of heating energy. It takes about 83kBTU to heat 200gal of water from 50F to 100F, which would be like 5 full heat ups from 50F. Of course there are the other convolved factors you mentioned (insulation).
I like my wood/propane mix for heating, because it's immune to power outages. At some point I'll get too old to cut/split/haul wood, though, and will have to figure something else out.
I'm not sure why there's a push to eliminate gas cooking in favor of electricity. Perhaps some people are concerned with methane leaks in the natural gas distribution system.
It can make a lot of sense in urban areas. In addition to removing the methane leaks (with their high GWP), it reduces the need to install/maintain expensive natural gas distribution infrastructure, and also improves indoor air quality by eliminating NO2 and CO production within the house. If the power goes out, you just use a propane grill in the backyard, or a small butane stove.
S̶p̶e̶c̶i̶f̶i̶c̶a̶l̶l̶y̶,̶ ̶f̶o̶r̶ ̶t̶h̶o̶s̶e̶ ̶w̶h̶o̶ ̶w̶e̶r̶e̶n̶'̶t̶ ̶a̶w̶a̶r̶e̶,̶ ̶s̶m̶a̶l̶l̶ ̶h̶o̶t̶ ̶t̶u̶b̶s̶ ̶a̶r̶e̶ ̶t̶y̶p̶i̶c̶a̶l̶l̶y̶ ̶h̶e̶a̶t̶e̶d̶ ̶t̶h̶r̶o̶u̶g̶h̶ ̶f̶r̶i̶c̶t̶i̶o̶n̶ ̶a̶n̶d̶ ̶w̶a̶s̶t̶e̶ ̶h̶e̶a̶t̶ ̶f̶r̶o̶m̶ ̶t̶h̶e̶ ̶c̶i̶r̶c̶u̶l̶a̶t̶i̶o̶n̶ ̶p̶u̶m̶p̶s̶ ̶a̶n̶d̶ ̶d̶o̶n̶'̶t̶ ̶h̶a̶v̶e̶ ̶d̶e̶d̶i̶c̶a̶t̶e̶d̶ ̶w̶a̶t̶e̶r̶ ̶h̶e̶a̶t̶e̶r̶s̶.̶ ̶Y̶o̶u̶ ̶c̶o̶u̶l̶d̶ ̶a̶d̶d̶ ̶a̶ ̶s̶e̶p̶a̶r̶a̶t̶e̶,̶ ̶m̶o̶r̶e̶ ̶e̶f̶f̶i̶c̶i̶e̶n̶t̶,̶ ̶w̶a̶t̶e̶r̶ ̶h̶e̶a̶t̶e̶r̶ ̶a̶n̶d̶ ̶r̶u̶n̶ ̶t̶h̶e̶ ̶p̶u̶m̶p̶s̶ ̶l̶e̶s̶s̶ ̶o̶f̶t̶e̶n̶,̶ ̶b̶u̶t̶ ̶i̶t̶'̶s̶ ̶n̶o̶t̶ ̶a̶s̶ ̶s̶i̶m̶p̶l̶e̶ ̶a̶s̶ ̶r̶e̶p̶l̶a̶c̶i̶n̶g̶ ̶o̶n̶e̶ ̶k̶i̶n̶d̶ ̶o̶f̶ ̶h̶e̶a̶t̶e̶r̶ ̶w̶i̶t̶h̶ ̶a̶n̶o̶t̶h̶e̶r̶.̶
Never mind. Apparently I was misinformed. The circulation pump moves the water through the heater, but isn't the primary heat source.
It's that, as well as the fact that having a gas stove means you have a gas hookup in the first place, so you're more likely to also use it for heating. That in turn leads to more emissions than other heating methods produce.
That’s an almost ideal case for an air-to-water heat pump though, the heat capacity and efficiency of which go up as the output water temperature goes down. Pool heating (and snow melting) are ideal use cases that can support a very low output water temperature and still get the job done (as compared to baseboard or cast-iron radiator space heating).
[0]: The incoming line was aerial and over the legal span length, so it had been attached to an insulator nailed to a tree halfway between the house and mast. Also the mast was deteriorating to the point that it needed to be replaced anyways and insurance was making noise about not allowing a new policy if it wasn't upgraded to at least 120A. We did a customer pole and went underground to the house. Much nicer aesthetics and I can now turn off a breaker on my side of the meter at the pole to do maintenance.
https://www.thespruce.com/service-panels-changed-in-the-1900...
Which says 100A didn't become common until the 1960's.
Maybe they have a heat pump setup which switches to propane when it gets really cold.
Wood is there, but somebody needs to feed it. And people inevitably get old or lazy about it and depend more and more on the convenient heat sources available.