Water Heater Efficiency

They don't always go together, but the long payback is usually more important.

The higher the factor, the more efficient. Good for comparative analysis. It is the amount of energy delivered versus the amount of fuel used.

Use those numbers for a comparison of model to model. Your actual numbers will vary depending on family size, laundry, etc. .

One of a few factors. Better burners, etc.

Manufacturers have increased the amount of insulation so adding more will have little value as compared to 30 years ago. More is always better, but there are diminishing returns on investment

Some new heaters cannot have a full blanket anyway, something to do with the new anti-explosion features. My son's new heater has holes all around the sides at/neart the bottom for part of this snti- explosion feature, and there was some sort of a warning about not adding a blanket.

Another line to consider is the A O Smith Vertex series. They offer thermal efficiencies from 90-96%. They offer an almost unlimited supply of hot water. If you have a dealer in the area you might want to check them out. Richard

Right. Like a 1" layer of plastic and fiberglass will have some effect on an exploding water heater.

Sounds to me like they are trying to prevent the explosion-- not minimize effects.

Jim

Maybe a controlled or even directional burst rather than let it decide how to go? The holes allow the vessel to rip letting the energy dissipate?

e:

I believe thse holes are to prevent the entry of flammables gases or at least prevent a explosion.

Miners used to use burning candles for lighting underground while working. It was safe because the metal screen prevented the flame from igniting coal dust in the mine

Ah, I thought these holes were around the tank, not the combustion chamber.