A heat pump that warms rooms does not always heat the water at your taps. The hot-water setup may be part of an air-to-water system, a separate heat-pump water heater, a retained boiler or electric tank, or another locally available arrangement. The right choice depends on how your household uses hot water and what the property can support.

Choose a starting point

What every proposal should make clear

Ask which equipment will heat tap water, where the water will be stored, how the system is expected to recover after a busy period, and what backup or boost mode does. The design should be based on a realistic account of peak use, not just the number of people or a tank-volume rule of thumb. Room or cylinder space, pipe runs, condensate drainage, electrical supply, controls, local requirements, and service access can all change what fits.

Product instructions and local plumbing, electrical, and building requirements govern the final design. A qualified local installer can confirm capacity, controls, safety measures, and commissioning for the specific home.

Guides in this collection

Domestic Hot Water and Integrated Hydronics

Do I Need a Hot-Water Cylinder With a Heat Pump?

Find out how a heat-pump system can provide tap water, when storage is involved, and which household and installation details shape the design.

October 2026

Domestic Hot Water and Integrated Hydronics

Hot-Water Delivery, Wait Times, and Heat Pumps

A heat pump heats water, while pipe layout determines how it reaches a tap. Learn which delivery and recirculation questions to ask a plumber.

October 2026

Domestic Hot Water and Integrated Hydronics

Replacing a Combi Boiler With Heat-Pump Hot Water

A UK combi-to-heat-pump change alters how space heating and tap water are supplied. Prepare for storage, demand, controls, and installation questions.

October 2026