Bottled gas heaters are only dangerous if put in a room without ventilation.
You could use a bottled gas heater, but, make sure that one window is open slightly.
We have a woodburning stove, its an old house, very old house, and has a chimney. However, like bottled gas heaters, it is necessary to make sure that the room has adequate ventilation.
The advantage of a woodburning stove is that you can use the top to boil a kettle or saucepan, or during one, very long electricity cut, cook a casserole.
However I appreciate that the OP is in a new house and does not have a chimney.
I have a dual fuel cooker with a gas hob. During power cuts you can turn the gas on and light it with a match, if the electric igniter isn't working. The same with a gas oven. if the igniter isn't working, turn the gas on and hold a match to the burner.