4 ms·

Not necessarily. There’s also something called air-to-water heatpumps which work like a mix of geothermal and air-to-air. My house (~1900sqf/200m2) is currentl

Not necessarily. There’s also something called air-to-water heatpumps which work like a mix of geothermal and air-to-air. My house (~1900sqf/200m2) is currently warmed up by a 10kW Nibe 2025 that’s connected to a 300L buffer tank. It does it by its own down to -5C, after which a 3kW resistance heater in the tank adds the missing effect. During the winter it uses ~1000-1500kWh for both heat and warm water.

rayiner 3y ago
We don’t have those in the US either.
jpfr 3y ago
I have a heat pump that used 200 kWh of electricity in a single day! Granted, it was the coldest day of the winter. Is your house especially insulated to get that low?
- ReptileMan 3y ago
  I think that in Europe traditional building materials - like bricks are natural insulators and our modern glass panels are 3 layers by default. So it may come as normal house in Europe is especially insulated in US. 200 kwh is quite a lot ... but also in US it looks like that the houses are bigger.
- 8fingerlouie 3y ago
  Not OP, but 200 kWh sounds like A LOT. I have a 7 kWh Vaillant Heat Pump in Denmark, and the highest consumption i saw last winter was just over 60 kWh per day, which was with -16C. My total consumption for a year with heat and hot water was around 3600 kWh ( 2200 ft2, 4 people). COP was around 3.7 on average for the entire year, so ~13,500 kWh of heat produced by the heat pump. For comparison, one m3 of natural gas is around 10.5 kWh of heat, so we produced the equivalent of 1,285 m3 of gas.
  - Beached 3y ago
    a lot of heat pumps in usa are air to air and have an electric heater in the heat pump to generate the heate when temperatures get so cold that air to air is not effective. without a geothermal system to extract the heat from, they get very expensive to run in very cold Temps when compared to gas hearing. Hensel why the myth that they don't work. no one thinks they don't work, they just think it's a worse solution than natural gas.
    - 8fingerlouie 3y ago
      My Air to water heat pump also has a backup resistive heater built in, which kicks in around 0C. It doesn't fully switch to it until -15C, but uses it for assistive heating for things that cannot wait, like hot water. Still, i use way less energy than i did with natural gas. The original estimate from the installer was that the backup heater would consume around 100 kWh during normal year, and considering my estimated "heating needs" of 13,000 kWh per hear, that's just a tiny fragment of that. Resistive heat is (almost) a 1:1 conversion of energy from electricity to heat, and the heat pump delivers a COP value of between 3.5 and 4, meaning i spend around 3500 kWh on the rest. For comparison, 1m3 of natural gas contains roughly 10.5 kWh of heat energy when burned in a gas boiler, so to deliver 13,000 kWh of heat, i would have to burn 1250m3 of gas. Where i live, in Scandinavia, electricity is around $0.13/kWh and natural gas is around $2.2/m3 (both including taxes), so in total it works out to : - Gas : 1,250* 2.2 = $2,750 / year - Heat pump : 3,500 * 0.13 = $455 / year Gas is about 6 times as expensive as a heat pump here.
- flemhans 3y ago
  That'd be €100 of electricity right there - in one day?? Damn
  - jpfr 3y ago
    We pay 12 cent/kWh in France. Still a lot.
deleted 3y ago
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rayiner 3y ago

We don’t have those in the US either.

jpfr 3y ago

I have a heat pump that used 200 kWh of electricity in a single day! Granted, it was the coldest day of the winter. Is your house especially insulated to get that low?

ReptileMan 3y ago
I think that in Europe traditional building materials - like bricks are natural insulators and our modern glass panels are 3 layers by default. So it may come as normal house in Europe is especially insulated in US. 200 kwh is quite a lot ... but also in US it looks like that the houses are bigger.
8fingerlouie 3y ago
Not OP, but 200 kWh sounds like A LOT. I have a 7 kWh Vaillant Heat Pump in Denmark, and the highest consumption i saw last winter was just over 60 kWh per day, which was with -16C. My total consumption for a year with heat and hot water was around 3600 kWh ( 2200 ft2, 4 people). COP was around 3.7 on average for the entire year, so ~13,500 kWh of heat produced by the heat pump. For comparison, one m3 of natural gas is around 10.5 kWh of heat, so we produced the equivalent of 1,285 m3 of gas.
- Beached 3y ago
  a lot of heat pumps in usa are air to air and have an electric heater in the heat pump to generate the heate when temperatures get so cold that air to air is not effective. without a geothermal system to extract the heat from, they get very expensive to run in very cold Temps when compared to gas hearing. Hensel why the myth that they don't work. no one thinks they don't work, they just think it's a worse solution than natural gas.
  - 8fingerlouie 3y ago
    My Air to water heat pump also has a backup resistive heater built in, which kicks in around 0C. It doesn't fully switch to it until -15C, but uses it for assistive heating for things that cannot wait, like hot water. Still, i use way less energy than i did with natural gas. The original estimate from the installer was that the backup heater would consume around 100 kWh during normal year, and considering my estimated "heating needs" of 13,000 kWh per hear, that's just a tiny fragment of that. Resistive heat is (almost) a 1:1 conversion of energy from electricity to heat, and the heat pump delivers a COP value of between 3.5 and 4, meaning i spend around 3500 kWh on the rest. For comparison, 1m3 of natural gas contains roughly 10.5 kWh of heat energy when burned in a gas boiler, so to deliver 13,000 kWh of heat, i would have to burn 1250m3 of gas. Where i live, in Scandinavia, electricity is around $0.13/kWh and natural gas is around $2.2/m3 (both including taxes), so in total it works out to : - Gas : 1,250* 2.2 = $2,750 / year - Heat pump : 3,500 * 0.13 = $455 / year Gas is about 6 times as expensive as a heat pump here.
flemhans 3y ago
That'd be €100 of electricity right there - in one day?? Damn
- jpfr 3y ago
  We pay 12 cent/kWh in France. Still a lot.

deleted 3y ago

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