I hope I don’t have to write all of this again! Do posts often get lost here?
Anyway, the topic was about choosing between a gas condensing boiler or a heat pump for a house with 140m² (1507 sq ft) of living space, 23cm (9 inches) exterior walls and 13cm (5 inches) Unipor interior walls, triple glazing, and photovoltaic panels on both sides of the roof (producing a maximum of 13,000 kWh per year).
It used to be a night storage heater house, and now I want to equip it with radiators and am considering two types of heat generators. A friend has been doing this for over 30 years with a heat pump and radiators. He says he maintains 25°C (77°F) in winter on 400m² (4,306 sq ft) and has costs of around €1,200.
Anyway, the topic was about choosing between a gas condensing boiler or a heat pump for a house with 140m² (1507 sq ft) of living space, 23cm (9 inches) exterior walls and 13cm (5 inches) Unipor interior walls, triple glazing, and photovoltaic panels on both sides of the roof (producing a maximum of 13,000 kWh per year).
It used to be a night storage heater house, and now I want to equip it with radiators and am considering two types of heat generators. A friend has been doing this for over 30 years with a heat pump and radiators. He says he maintains 25°C (77°F) in winter on 400m² (4,306 sq ft) and has costs of around €1,200.
To my knowledge, that would be a mistake. How close am I with my assumption of a 15cm (6 inches) masonry wall plus 8cm (3 inches) of external thermal insulation composite system (ETICS) making up the 23cm (9 inches) exterior wall? A 13cm (5 inches) interior wall would not match any masonry unit I know of. 12.5cm (5 inches) might still be possible depending on the manufacturer, especially with aerated concrete.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
nordanney schrieb:
For 30 years? I thought he had converted the house from oil heating?
In any case, €1,200 electricity costs for that size, the age of the property (only 10cm (5 inches) insulation), 25 degrees Celsius (77°F), and using radiators is not realistic.
That’s roughly 4,500 kWh electricity consumption.
Check the heat pump consumption database. You’ll find real figures there—typically new builds (extract for 2019 and area over 200 sqm (2,150 sq ft) below / some consumption values are very low if the system was only commissioned during 2019). The
Okay, I looked a bit and almost all of them have underfloor heating, so it’s hard to compare directly.
He built the house in the early 1970s, and I believe it was initially heated with oil, but around 10 years later he started using a heat pump system.
11ant schrieb:
To my knowledge, that would be a mistake. How close am I with my assumption of a 15 cm (6 inches) masonry wall plus 8 cm (3 inches) external thermal insulation composite system (ETICS) making up the 23 cm (9 inches) exterior wall? A 13 cm (5 inches) interior wall would not be possible with any masonry material I know. 12.5 cm (5 inches) might still be feasible depending on the aerated concrete manufacturer. Let’s not quibble over millimeters now... there is plaster on it too, and of course I didn’t scrape it all off to measure, obviously. If I subtract the 10 cm (4 inches) insulation from the total thickness, I get roughly 23 cm (9 inches). These are just approximate figures.
Sorry, I missed the note
and therefore didn’t realize that you are talking about a second-hand property.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
derGlomb schrieb:
It was a former night storage heater house that I now want to equip with radiators and am considering two heat generators.
and therefore didn’t realize that you are talking about a second-hand property.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
derGlomb schrieb:
A friend has been doing this for over 30 years with a heat pump and radiators. He says in winter he maintains 25°C (77°F) in a 400 m² (4,300 ft²) house and has costs around 1200€. Either simply not true or key information is missing.
Missing information might be: "there’s a fireplace running 24/7"; "solar panels on the roof are included in the calculation"; "a server farm in the basement"…
I’m a fan of heat pumps and solar power, but if you have an older house with radiators and gas is available on the street, I would prefer to run it on gas.