Gas heaters

My first house in NZ (Hamilton East) did not have any efficient heating system installed. I bought a portable gas heater which had a 9 kg LPG gas bottle. It was adequate for heating the lounge. The bedrooms had very ancient electric heaters which were expensive (dangerous?) to use. That old house on Sheridan Street was damp and moldy most of the time. Christine and I used to sit near a window just to get the warmth of the sun during the winter months.

There was one thing about gas heaters which I did not understand at first:

fuel+oxygen=heat (CO2+water vapour)

Beside the production of heat, there are also by products which are very undesirable. These must be removed from the house in order to stay healthy. At that time I did not know about HRV, demumidifyer or heat pumps.  There were also no sellers for these modern heating systems. In fact both my houses in NZ did not have Pink Bats insulation in the walls or ceiling. The windows do not have double glaze and the floors were not insulated at all for the warmest feet in the world!