Invoice from yesterday for December 2023. I used 201 m3 of gas, calculated by provider as being equal to 2224kWh of power for which I paid 682.81 PLN (157 € to be exact) in total including taxes and surcharges. So 3.397 PLN or around 0.78 EUR per m3.

December was one of the coldest months this season. Last year I used maximum of 250 m3 per month which happened to be January/February. This then exceeded 200€

This includes both warm water and heating using low-temperature floor heating. Current thermostat settings give me 22C on the base floor and 20C on the first floor (where most heat escapes, obviously). I also have mechanical ventilation with recuperation.

Shit’s expensive.

With current prices of electricity, the same heating power with perfect constant COP of 3 (not possible with December temps for air heat pump) would cost me 666 PLN. (Nice). How can I offset the cost of installing it in the first place LOL.