JohnStoppafarty
Bench
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You say "about" like it's nothing. Wouldn't the efficiency depend on how that electricity was generated?different principals
They have a high COP (coefficient of performance), they work on relocating heat from he air to the water, and the COP is just the cost of relocating that heat, whereas gas or electricity are a forms of energy that is being transferred to another form of energy (yes, heat is a form of energy)
So gas is about 80% efficient (about 20% goes out through the flue), electricity is about 100% and heat pumps are approximately 300% as they use heat that already exists and simply reloate it
Instantenous gas uses much more energy but only on demand as you are not paying to keep a large tank of hot water at 70 degrees 24/7
again, works off different principals
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