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Electric water heater and heat pump water heater comparison

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Elements of comparison

The match between a heat pump water heater and a conventional tank storage water heater is even more unbalanced as the constraints imposed by thermal regulations prohibit the second one in the new housing.

To know more: about compact electric water heaters

To know more: heat pump water heater

Consumption comparison chart

The statistics in Europe show a daily average consumption of 40 to 50 litres of hot water at 55°C per adult (30 L for children). Currently, a heat pump water heater consumes, in average, between 2 and 3 times less electricity than a conventional water heater according to the surrounding environmental conditions.

Electric consumption comparisonElectric water heaterHeat pump water heater
150 litres (sink + shower + washbasin) – 2 people
about 400£ per yearabout 130£ per year
200 litres (sink + shower/bath + washbasins) – 3 peopleabout 440£ per yearabout 150£ per year
250 litres (sink + shower/bath + washbasins) – 4 people including 2 children
about 490£ per yearabout 160£ per year
300 litres (sink + shower/bath + washbasins) – 5/6 people
about 530£ per yearabout 175£ per year

This table does not take note of the arrival of new electric multi-tank water heaters, allowing to heat only a certain amount of water according to the needs. The heat pump water heater is especially interesting for large capacities (250 litres to 300 litres) as its COP (coefficient of performance) falls with lower capacity.

Overall comparison chart

ComparisonElectric Water HeaterHeat Pump Water Heater
Installation in the newForbidden by the thermal regulationAuthorised. Benefits (partially) of an inexhaustible and clean energy.
Installation in renovationAuthorisedRecommended under conditions
Installation Complexity
Very easyDepend on the connexion mode (outside air or room air)
Compactness
Starting from 15 litres. Wall or floor mountingStarting from 150 litres. Few models from 50 L (COP reduced). Usually floor mounting.
Noise Impact
NoneNoisy to very noisy according to models.
Hygiene Water Quality
Stagnation, limestone, 60°C at leastIdentical constraints except stainless steel tank models heated by an external heating belt.
Maintenance
Risks of scaling and corrosion reduced on high-end modelsSame + heat pump to maintain.
Guarantee Period
Usually 7 years on the tanks, except new stainless steel tanksequivalent
Heating Time
5 to 6 hours for 300 Litresequivalent

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Summary
Title
Electric water heater and heat pump water heater comparison
Description
Currently, a heat pump water heater consumes, in average, between 2 and 3 times less electricity than a conventional water heater
Author
Publisher
Foxof
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