Last updated: 16/10/2022

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An immersion heater is a device used to heat water. It consists of an electric heating element, usually made from copper or aluminium wire wound around a ceramic insulating core and immersed in the hot water tank. The temperature can be controlled by adjusting the power supplied to it via thermostat control (usually digital).

Immersion Heater: Bestsellers and current offers in the UK

The best immersion heater in the UK: Our selection

Replace your old immersion heater thermostat

This immersion heater thermostat is the perfect replacement for your old one. It has a blade length of approximately 17 inches and an overall length of approximately 18 inches. This cylinder thermostat is used as replacements for between 27″ to 36″ heaters. This immersion thermostat has an in built electrical protection which will require manually resetting in the event of fault detection sometimes known as water cylinder thermostat

Immersion Heater: Frequently asked questions

What types of Immersion Heater are there and what determines a good product?

There are two types of immersion heaters, the first is a standard electric heater and the second type is an infrared heater. The main difference between these two types of heaters is that one heats water by means of electricity while another uses electromagnetic radiation to generate heat. Both have their advantages and disadvantages which we will discuss below in more detail.

There are a few things to consider when choosing an immersion heater. The first is the wattage of the unit, which will determine how much heat it can produce and for how long. You also want to make sure that you choose one with enough power so that your water doesn’t take too long to get warm or cool down again after use. It should be powerful enough so that you don’t have any issues getting hot water in time for showers or baths, but not so strong as to waste energy heating up more than necessary at other times of day. Another thing worth considering is whether you prefer a tankless model over a traditional one – this depends on what kind of space restrictions there might be in your home (tankless models tend to work best if they won’t need access from outside). Finally, look into safety features such as automatic shut-off mechanisms and temperature sensors; these help prevent accidents like scalding by automatically turning off if something goes wrong.

Who should use a Immersion Heater?

Immersion heaters are the ideal choice for anyone who wants to enjoy a warm shower or bath, but doesn’t want to spend money on heating their water. They can be used in both new and existing homes, as well as commercial properties such as hotels, gyms and spas.

Based on what criteria should you buy a Immersion Heater?

The first criterion is the purpose of buying the product. Ask yourself why do you need a Immersion Heater? Maybe it’s for your family, or maybe you are planning to resell it. For either case, consider what features would be useful and how often will they use it. Another important factor is your budget. There are many types of Immersion Heaters in the market that come with different price ranges; therefore decide carefully between them depending on their prices as well as functionality.

The power of the Immersion Heater is one of the most important factors to consider. Another factor is whether or not you’re looking for a portable, electric immersion heater or if you want something that can be permanently installed in your home. There are also different types of heating elements and controls available with each type having its own pros and cons so it’s best to do some research before making any decisions about which model will work best for your needs.

What are the advantages and disadvantages of a Immersion Heater?


Immersion heaters are the most efficient way to heat water. They have a very high efficiency rating, which means they use less energy than other types of heating systems. This is because immersion heater’s work by directly heating the liquid in your tank rather than using electricity to power an element that heats up air and then blows it into your hot water system.


The main disadvantage of an immersion heater is that it can only heat the water in its tank. If you have a large house, then this may not be enough to keep all areas warm at once. It also means that if your hot water runs out, there’s nothing else for you to use until it heats up again – which could take hours.

Shopping Guide: Everything you need to know

Which brands and manufacturers are represented in our review?

In our review, we present products from various manufacturers and suppliers. The list includes products from the following brands and manufacturers, among others:

  • Backer
  • Backer
  • Heatrae Sadia

What is the price range of the featured products?

The cheapest Immersion Heater in our review costs around 16 pounds and is ideal for customers who are conscious about their money. However, those who are willing to spend more money for better quality can also spend around 144 pounds for one of the more expensive products.