Electric water heaters are a reliable and energy-efficient solution for heating domestic hot water in homes, apartments, offices, and commercial buildings.

At waterheater.shop, you can buy a wide range of electric water heaters in various capacities, from 7 to 80 liters, suitable for kitchens, bathrooms, and multiple taps simultaneously.

Whether you're looking for a 10-liter electric water heater for the kitchen, an 80-liter water heater for the bathroom, there's always a suitable model available. Modern electric water heaters combine compact dimensions with high performance and a long lifespan.

Most electric water heaters fall within energy class C to B, ensuring low power consumption and lower energy costs. Thanks to high-quality insulation and smart thermostats, the water stays hotter for longer, ideal for those looking to buy an energy-efficient electric water heater.

Quickly find your ideal water heater using our search engine. Our handy filters, such as:

Capacity (7L 10L, 15L, 30L, 50L, 80L),
Energy class (C, B),
Fast heat-up time electric boiler,
Wi-Fi control,
Smart/self-learning function,
Programmable,
Adjustable thermostat,
Anti-legionella function,
Safety valve and overpressure protection,
Vertical and horizontal boilers,
Compact electric boiler for small spaces.

Easily compare specifications and prices and order your electric boiler online now.

How Many Liters of Boiler Do I Need?

Choosing the right boiler capacity is essential for both comfort and energy consumption. A boiler that is too small will quickly run out of hot water. A boiler that is too large will consume unnecessary electricity. In this comprehensive guide, you'll discover exactly how many liters of boiler you need for your home, family situation, and hot water usage.

Why the right boiler capacity is important

The capacity of a boiler determines how much hot water is immediately available. The larger the tank, the more hot water you can use before the system needs to heat up again.

Important factors:

Number of people in the house
Number of taps (shower, bath, kitchen)
Simultaneous use
Comfort level

Boiler capacity per situation

Kitchen or sink only

A compact boiler is sufficient for a tap in the kitchen or utility room.

Recommended:

7-liter boiler

10-liter boiler

15-liter boiler

1–2 people (studio or apartment)

Do you use the boiler for both shower and sink?

Recommended:

30-liter boiler

50-liter boiler

3 people

Shower and kitchen can be used simultaneously.

Recommended:

80-liter boiler

Quick selection guide

Kitchen → 7–15 liters

2 people → 30–50 liters

3 people → 80 liters

Conclusion

Not sure? Choose something a little larger than too small. A well-tuned boiler prevents comfort problems and saves energy in the long run.

Calculating Boiler Energy Consumption

An electric boiler uses electricity to heat water and keep it warm. But how much does that cost per year? We explain it simply here.

How do you calculate your consumption?

Formula:

kWh = power (kW) × time (hours)

Example:

2 kW × 2 hours = 4 kWh per day.

Average annual consumption per volume

10 liters → ± 500 kWh

50 liters → ± 1,200 kWh

80 liters → ± 1,700 kWh

At an electricity price of £0.27 per kWh, a 80-liter boiler costs approximately £459 per year.

How do you save energy?

Set the temperature to 60°C
Use the eco mode
Choose the correct volume
Insulate pipes
Avoid unnecessarily high temperatures
Shower for less time, for example, for the length of a song.
Turn off the tap while washing your hair.
Use a water-saving shower head.

Conclusion

Choosing the correct boiler volume provides the greatest savings. Too large means unnecessary consumption, too small means more frequent heating.

Difference Between Vertical and Horizontal Water Heaters

Are you unsure whether to choose a vertical or horizontal water heater? The choice depends on available space, mounting position, and efficiency.

Vertical Water Heater

Advantages:

Better heat distribution
More efficient energy use
Longer lifespan
Most popular option
Hot water naturally rises, making vertical installation technically more efficient.

Horizontal Water Heater

Advantages:

Ideal for limited height

Suitable for mounting above a door or against the ceiling

Disadvantage:

Slightly less efficient heat distribution

Which should you choose?

Do you have sufficient height? Choose a vertical water heater.

Do you have limited space? Then a horizontal water heater is a practical solution.

Which Water Heater for a Family?

Sufficient hot water is essential for families. Showering, washing dishes, and occasionally taking a bath require the right capacity.

SKU	TTONDU-13
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Over temperature protection B series

Amount

Often bought together

Flue gas protection B-11