Comment by deepsun

> Gas heating (Single room) (1 hour of use) -- 2700Wh.

Wow dude, your room is very-very poorly insulated. Having a 2700W heater turned on constantly just for one room is a lot. If it's 0C outside and 20C inside, a typical room should not lose more than 500W, but better be in 200--400W range .