Most of the newer ones already have spray foam insulation. Depending on the
water temp and basement temp, turning them off during the day might not save
much. If the basement is cold, using those insulating blankets can trap
moisture.

wrote in message
ups.com...
What about doubling or tripling the insulation, that would cut stand by
losses dramatically.

although the heater will not be actively using gas during off hours,
when the timer turns back on the heater will have to warm up the water.

thats why insulation might be a better investment

dont obstruct any air vents