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Frequently Asked Questions
Why is a pool sized by surface area rather than volume?
Most heat leaves through the open surface.
Evaporation is the single largest loss.
That loss scales with area, not with depth.
Volume only sets the first heat-up time.
Area sets what holding temperature costs.
A deep narrow pool is cheaper to hold than a shallow wide one.
Which option heats fastest?
Combustion, by a wide margin.
It reaches full output within minutes of firing.
Air temperature does not limit it.
A heat pump ramps slowly and steadily.
Solar cannot be called on at all.
Fast recovery is what combustion is bought for.
Why do heat pump ratings need conditions attached?
Output changes with the air the machine draws from.
A rating taken in mild air is not the rating in cool air.
Manufacturers publish at different reference conditions.
Headline output on its own can mislead.
Ask for output in the coldest month of intended use.
That figure decides whether it will hold temperature.
How much collector area does solar heating need?
Roughly in proportion to the pool surface.
Warm climates and short seasons need a smaller ratio.
Shading and orientation change it more than latitude does.
Roof structure often sets the practical limit.
Undersized collectors extend the season rather than raise the peak.
Size against the pool, not against the available roof.
Can two types of heater be combined?
Commonly, and it is often the cheaper answer.
Solar or a heat pump carries the base load.
Combustion covers recovery and cold spells.
The control system decides which runs when.
Hydraulics must allow either to serve alone.
Agree the sequencing before plant is ordered.
Where does a pool cover fit into this?
It belongs in the same decision as the heater.
Most loss is evaporative and a cover stops it.
An uncovered pool can need several times the input.
A heater sized without one will disappoint.
Covers also cut water and chemical consumption.
Specify the two together.
What has to be checked before ordering a heater?
The flow rate it needs from the circulation pump.
Whether the existing pump can actually deliver it.
Fuel supply, flue route or electrical capacity.
Clearances the manufacturer requires around the unit.
Compatibility with any controller already installed.
Certification for the market it is going to.