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—Heating and cooling

Installing a pool heat pump

A heat pump needs air, water and power. Getting all three right at installation decides how well it performs for years.

Heat pumps are installed outdoors on a firm, level base with clear space around them for air to flow in and out. They are plumbed into the return line after the filter, usually with a bypass and valves so flow through the unit can be set and the unit isolated for service. Condensate water produced during operation needs draining away.

Temperature guides explain how pools in a hot climate are heated in winter and cooled in summer.

The electrical supply must suit the unit’s rating, with appropriate protection and isolation, installed by an electrician. Commissioning checks flow, settings and operation in heating and cooling modes, and the controls are explained to the owner.

01Summary

What matters most here

  • Air space

    Clear airflow around the unit.

  • Plumbed after the filter

    With a bypass and valves.

  • Dedicated power

    Sized for the unit.

02Detail

Installation elements

  • Base

    Firm, level, with vibration pads.

  • Clearances

    Space around the unit as the manufacturer specifies.

  • Plumbing

    After the filter, with bypass and isolation valves.

  • Condensate

    Drained away from the unit.

  • Electrics

    Supply, protection and isolation.

03Before you start

Before installation

  • Choose a location

    With airflow and noise considered.

  • Check power

    Board capacity and route.

  • Check pump flow

    Meets the unit’s minimum.

—In practice

How to use this

Choose a location with clear airflow on all sides and a firm, level base. Plan plumbing into the return line after the filter, with a bypass and valves so flow can be set and the unit isolated. Drain condensate properly, confirm the electrical supply and protection, and commission the unit with correct flow and settings.

Mistakes worth avoiding

No bypass arrangement
Without a bypass and valves, flow through the unit cannot be adjusted and the unit cannot be isolated for servicing.
Ignoring condensate
Heat pumps produce condensate water. Left to drain anywhere, it stains paving and can undermine the base.

04FAQ

Common questions about this

Why install after the filter?
So clean water passes through the heat exchanger.
What is the bypass for?
To set the correct flow through the unit and isolate it.
Why is there water under my heat pump?
Condensate is normal; it should be drained away.
Does it need its own circuit?
Usually; the electrician confirms.

05Read next

More pool guides on this

Filed under heat & cool system installation. Every pool guide is listed on the pool guides page.

—NEXT

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