Compare Heat pump water heaters: 450 models

Heat pump water heater or heat pump: what is the difference?

A heat pump water heater does one job: it heats tap water. The unit sits on or next to a storage tank, takes heat from the air around it – the room, the outside air or the ventilation exhaust – and keeps the hot water ready for showers and taps. A regular heat pump heats the whole home through radiators or underfloor heating and is sized in kilowatts for the heat demand of the building. Many homes have one without the other.

The two are also rated differently. A space-heating heat pump is described by its seasonal efficiency (SCOP) and its output in kW. A heat pump water heater has its own energy label under EU regulation 812/2013 with the water heating efficiency ηwh, an energy class, the declared load profile and the annual electricity use. Because ηwh is measured against primary energy, a good heat pump water heater scores well above 100%, while an ordinary electric boiler stays far below it. The load profile, from 3XS (hand washing) to 4XL (large household or business), shows which tapping pattern the figures belong to: compare ηwh and annual use only within the same profile.

The register behind these pages does not list tank volume, heating-up time or electrical power, so check the manufacturer’s datasheet for those before you buy. If you already have a heat pump for space heating, first see whether it can serve a hot-water cylinder; a separate heat pump water heater mostly makes sense when you replace an electric boiler or gas water heater, or when there is no central heat pump.

When choosing, also consider noise and location. Indoor sound power matters if the unit stands in a utility room, laundry room or next to a bedroom; for a model with an outdoor unit, the outdoor noise matters too. A unit that takes heat from the room itself cools that room down, which makes little difference in an unheated basement or garage but does in a living space. Smart control lets the water heater run mainly when your own solar power or cheaper electricity is available.

Heat pump water heaters

ENERGIE AQUAPURA BOOSTER 200I

ENERGIE AQUAPURA BOOSTER 300I

Eco Hot Water 01-05 150l

Oekoboiler ZG 02-05 150l

Eco Hot Water 01-05 200l

Oekoboiler ZG 02-05 200l

Eco Hot Water 01-05 300l

Oekoboiler ZG 02-05 300l

Zestar HS04V-Q

Zestar HS06V-Q

Zestar HS10V-Q

Zestar HS12V-Q

Zestar HS08V-Q

Migloor PAVH-15V4FBA

Eco Hot Water 01-05 350l

Oekoboiler ZG 02-05 350l

Dimplex Edel 200 Water - Water D893332

intuis 352231 - Edel 150 EAU /3

intuis 352431 - Edel 270 EAU /3

Tiki DHW W 300

SOLIUS QSWHA160L

STIEBEL ELTRON SHP-I 300 H Plus

Ochsner EUROPA N 200 CA

STIEBEL ELTRON SHP-I 200 Plus

STIEBEL ELTRON SHP-O 200 Plus

Tecalor TTA 200.1 comfort

Viessmann 7959724 Viessmann DHW Booster HP 170L 1.2 kW

Kronoterm ESSENTA-303/1 E D PV P3 (EPREL 2659109)

Metro Therm METRO MICROBOOSTER P 260

Ochsner EUROPA N 300 CA

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Heat pump water heater or heat pump: what is the difference?

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