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Frequently Asked Questions
What does moving heat rather than making it mean?
It transfers heat that already exists.
From the air into the water.
Using electricity to run a compressor.
Rather than to become heat itself.
Which is why it beats an element.
How much better is it?
Several units of heat per unit of power.
Typically three or four.
An immersion heater manages one.
And cannot do better by design.
It is a difference of kind, not degree.
Where does the heat actually come from?
The air around the unit.
Which leaves colder and drier.
That is not a side effect.
It is where the energy came from.
And it decides where one can go.
What happens in a small cupboard?
It cools the cupboard, then struggles.
Because it recycles its own exhaust.
Drawing heat from air it just chilled.
Performance falls away steadily.
It needs volume, ducting or an outdoor unit.
Why is recovery so slow?
Because transferring heat takes time.
Longer than dumping it in with an element.
So recovery is measured in hours.
Not in the minutes a boiler takes.
The cylinder covers the gap.
Why are they such large appliances?
Because storage is doing the work.
The pump runs steadily and slowly.
The cylinder covers peak demand.
So the tank is sized generously.
Even where the pump itself is small.
Why fit a backup element at all?
Cold snaps, failures and disinfection.
A scheduled high-temperature cycle.
Which the heat pump alone cannot reach.
A system running mostly on its element.
Is an expensive water heater, not an efficient one.