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Frequently Asked Questions
What governs the sizing?
Recovery rate, not tank volume.
How fast heat goes back in.
Against an hourly demand curve.
A tank that refills by noon.
Has failed a building that needs it at eight.
Why is a demand profile needed?
Because commercial draw is not even.
Heavy within predictable windows.
And almost nothing between them.
A peak figure alone tells you little.
The shape of the day is the input.
Why is it usually paired with something?
Because sizing for the absolute peak.
Gives a machine oversized all year.
So the heat pump carries base load.
And a boiler or element covers peaks.
And the coldest days.
What decides how well that works?
The control strategy between them.
Which is part of the specification.
A poorly set one runs the backup.
Far more than was intended.
And the savings disappear.
Why does Legionella control matter here?
Because stored water is regulated.
Under a written water safety regime.
And a heat pump runs cooler than a boiler.
So pasteurisation has to be designed in.
Along with the records of it.
Where should the heat come from?
Somewhere better than outdoor air, ideally.
Extract air from the building.
Plant room heat, or a process waste stream.
All are warmer and more constant.
Which raises output and lowers cost.
Is it just a bigger domestic unit?
No, and treating it as one goes wrong.
Different sizing basis entirely.
Different controls and backup.
And a regulatory regime attached.
It is a plant item, not an appliance.