about the water heater, i have got used to cold water after living in PG. The techanican fr the water heater company explained to me that the mixer we are using isn't sensitive so when switch off the tap, the gas stop burning, when on the water, they will begin to heat up again. as this is a gas heater, best to change the mixer to a one which can control the temperature. its like a round tap and got digits on it, so that we can adjust to the desired temperature. I've tried that recently in a hotel and yes, the temperature is very stable.