The Tank › energy star
- June 16, 2009 at 9:57 am #11523dj1inncParticipant
is the only differance between an energy star rated water heater & one not rated the amount of insulation ?June 17, 2009 at 12:48 pm #11527Larry WeingartenParticipant
Hello: Insulation matters, but it isn’t that simple. Here is a link that gives some detail. http://www.energystar.gov/index.cfm?c=new_specs.water_heaters
Yours, LarryJune 17, 2009 at 2:13 pm #11530June 17, 2009 at 2:16 pm #11531undee70ssParticipant
Heres a new type of water heaterJune 17, 2009 at 6:58 pm #11534energyexpertParticipant
Electric water heaters all use electricity at 100% efficiency. Differences in the amount of energy they use in a year for a given amount of hot water is insulation and heat traps. Since all electric water heaters use electricity at 100% efficiency none are rated as energy star.
You can buy a heat pump whose sole purpose is to take heat from the air and make hot water. It will make hot water at 1/2 to 1/3 the cost of resistance heat. To qualify for the tax credit the EF (energy factor) must be greater than or equal to 2.0.
There are a lot of factors which make a gas water heater more efficient: Tankless, power vent, condensing, etc. You have to take into account utility rates, efficiencies, and amount of HW used.
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