How efficient is solar water heater?
How much savings can we get from solar water heater? Say in percent (annually). I don't know how solar companies can guarantee the benefits of investing solar panels.
depends on the sun.
and the storage you have.
and the amount of hot water you use.
and the insulation.
i don't know either.
clearly they could claim "the average user saves ????", and you couldn't check.
however, a hot shower is quite a luxury, so it's probably a good investment.
if you were really interested, you could probably do a reasonable calculation.
you're not using the furnace, so it's only cooking and hot water.
you could fill a bucket and time it, and calculate how much water you use.
i'm sure someone at the gas company could tell you how much gas it would take to heat that.
keep in mind, in the winter, when it's harder to calculate because of the furnace, the water comes into the house colder, and so is more expensive to heat.
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