Power blackouts . As already mentioned low temperatures can be accompanied by power blackouts. Although the two methods already mentioned are the ideal ones to keep your water warm, they need electricity. The use of a UPS is not recommended, since a 200 W heater will drain the battery within 45 minutes alone. And of course, you can t plug your air conditioner on a UPS, it will not even start.
Fireplace warm the place .
Never try to heat a place with an open fire. Bear in mind that these two gases do not smell and they will gradually suffocate you. This option can only be used as an emergency for a small number of small tanks. Heating water is always preferable because of its huge heat capacity. Gas boil water.