Tankless demand water heaters.
Super insulated gas hot water heater.
An insulation blanket can make some water heaters more energy efficient.
I have located 2 gas hot water heaters a kenmore power miser 12 a bradford white m4 with 2 insulation.
In general a storage tank heater is only appropriate for homes that frequently use large amounts of hot water.
The kenmore specs say that the 2 insulation has an r value of 16 r16.
Rl94in luxury series tankless water heater the rl94in and all of the luxury series models offer the highest output of rinnai s non condensing line of tankless heaters.
Rinnai luxury series.
2 i noted that both the cold and hot water lines going into the water heater before insulation mod did not have dielectric connections from the copper pipes connecting to the water heater.
If your water heater is located in unconditioned space a garage basement or attic or you don t want added heat install a heavy blanket r 11 or better.
The higher the r value the thicker the blanket and the more insulating horsepower.
This means that galvanic corrosion two dissimilar metals in direct electrical contact will occur immediately after the water heater plumbing lines are.
On the upside newer storage tank heaters feature insulation that helps prevent heat loss.
Unlike storage tank heaters tankless water heaters keep water hot without using a tank.
More than 2 inches or an r valu.