Heat Pump Hot Water vs Electric Cylinder

How they differ

A standard electric cylinder heats water with a resistive element — one unit of electricity produces roughly one unit of heat. A heat pump water heater uses a refrigeration cycle to extract heat from the surrounding air, so it can deliver considerably more heat per unit of electricity.

The trade-off is complexity and up-front cost. A heat pump has a fan and compressor, needs suitable airflow, and typically costs more to install.

Where an electric cylinder still makes sense

Lower up-front cost, simple installation, quiet operation and no outdoor space requirement all count in favour of a conventional cylinder. For smaller households, apartments, rentals with lower usage, or tight installation locations, it can remain the more practical option.

Where heat pump hot water tends to win

Households with high, consistent hot-water demand generally see the strongest case for a heat pump, because the efficiency advantage applies to every litre heated. Owners planning to stay in the property long term also benefit more from the lower running cost.

Questions to ask an installer

• What capacity and recovery rate suits our household?
• Where would the unit be located, and how noisy is it there?
• Does our pipework or switchboard need upgrading?
• What warranty covers the product and the workmanship?
• What is the realistic difference in annual running cost for our usage?