Best Water Heaters & Parts of 2026

Mohammed Clark Avatar
Mohammed Clark
Last Updated: 4 Feb 2026

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Water heaters and their accompanying parts are essential for providing hot water in residential and commercial settings. These products vary in size, capacity, and fuel type, and can include gas or electric heaters, tanks, thermostats, and heating elements. Properly functioning water heaters can improve quality of life and productivity, while malfunctioning ones can lead to inconvenience and potential safety hazards. It is important to select and maintain these products carefully to ensure efficient and safe operation.

At a Glance: Our Top Picks

Triton Showers 9.5 KW Electric Shower Cover #TOP 1
Triton Showers 9.5 KW Electric Shower
ftb score rating icon 9.8
Adjustable Pressure Reducing Valve with Gauge Cover #TOP 2
Adjustable Pressure Reducing Valve with Gauge
ftb score rating icon 9.7
Vaillant Ecotec Expansion Vessel and Pressure Relief Valve Bundle Cover #TOP 3
Vaillant Ecotec Expansion Vessel and Pressure Relief Valve Bundle
ftb score rating icon 9.5

Top 5 Water Heaters & Parts

#TOP 1

Triton Showers 9.5 KW Electric Shower

MOSV09SG
White
9.5 KW
Triton Showers 9.5 KW Electric Shower Cover
Triton Showers Seville, Shower Electric, 9.5 KW, White, Instant Hot Water, Replacement Shower, Anti Twist Hose, Bathroom Showering Unit

The Triton Showers Electric Shower offers excellent control with its rotary power settings, allowing you to choose between cold, eco, and high options. You can easily adjust the temperature and flow separately, ensuring your shower experience is just how you like it. It features multiple cable and water entry points, making replacement straightforward and hassle-free. Additionally, the easy clean shower head with a single spray pattern provides a convenient solution for maintaining hygiene and enjoyment during your showers.

What We Like
Easy temperature and flow control
Multiple entry points for replacement
Easy clean shower head
Anti-twist hose to prevent kinks
#TOP 2

Adjustable Pressure Reducing Valve with Gauge

Unvented Components Europe
UN-42-3
‎chrome / Black
Adjustable Pressure Reducing Valve with Gauge Cover
Adjustable Pressure Reducing Valve 15mm with 0-10 Bar Gauge

The Pressure Reducing Valve is designed to provide precise control over your water pressure. It comes pre-set to 3 Bar, ensuring that you can start using it straightaway. You can fully adjust the pressure from 1 to 6 bars, allowing you to tailor it to your specific needs. The 15mm compression connections make installation straightforward, ensuring that you can set it up quickly and efficiently. This valve also features a pressure gauge with a 0-10 scale, helping you monitor the pressure easily.

What We Like
Fully adjustable pressure settings
Easy installation with 15mm connections
Includes a clear pressure gauge
Pre-set for immediate use
#TOP 3

Vaillant Ecotec Expansion Vessel and Pressure Relief Valve Bundle

181051 178985
Vaillant Ecotec Expansion Vessel and Pressure Relief Valve Bundle Cover
Expansion Vessel Replacement for Vaillant 181051 Bundle with Pressure Relief Valve 178985

The Vaillant Ecotec Bundle includes the original Expansion Vessel 181051 and the Pressure Relief Valve 178985, ensuring you have the essential components for your water heating system. The expansion vessel helps maintain pressure stability, preventing potential damage to your system. The pressure relief valve provides safety by releasing excess pressure, protecting your equipment from failures. Additionally, the bundle includes a washer, making installation easier and more convenient for you.

What We Like
Original components included
Enhances system stability
Increases safety measures
Easy installation
#TOP 4

Primaflow Duratherm 7 Inch Resettable Immersion Thermostat

49020307
Primaflow Duratherm 7 Inch Resettable Immersion Thermostat Cover
Duratherm Resetable Immersion Heater Thermostat 7 Inch 49020307

The Primaflow Duratherm Thermostat is a 7-inch immersion heater thermostat designed for water cylinders. Its blade length of approximately 7 inches and overall length of around 8 inches make it a suitable fit for many heaters. The built-in electrical protection is a handy safety feature that requires you to manually reset it if a fault is detected, ensuring safe operation. This resettable function helps prevent damage and gives you control over the heating system, making it a practical choice for maintaining your water heating setup.

What We Like
Compact 7-inch blade length
Built-in electrical safety protection
Manual reset after fault detection
Suitable for water cylinders
#TOP 5

Inlet Control Multibloc Valve with 3 Bar Pressure

Unvented Components Europe
3-6-bar-inlet-control
Inlet Control Multibloc Valve with 3 Bar Pressure Cover
Inlet Control Multibloc Valve Group for Cylinder - 3 Bar Pressure Reducing Valve with 6 Bar Pressure Relief

The Unvented Components Valve Group is designed to efficiently manage water pressure with its 3 bar pressure reducing feature, ensuring stable water flow in your system. The 6 bar pressure relief valve protects your system from excessive pressure, providing peace of mind. An integral strainer helps keep your water clean by filtering out impurities, while the ‘Droptight' pressure reducing cartridge enhances reliability and performance. These features combined ensure you have a dependable water heating experience.

What We Like
Reliable pressure management
Protects against excessive pressure
Enhances water quality
Improves performance
Buying Guide Image

Frequently Asked Questions (FAQs)

1. Can you replace parts on a water heater?

If you're replacing a water heater, you can replace it with the same type of unit. However, you might also consider upgrading to a larger tank or a tankless heater.

2. What are three types of water heaters?

There are five main types of water heaters; conventional, tankless, heat pump, solar, and condensing.

3. What are the two types of water heaters?

There are two main types of storage water heaters: gas/oil water heaters and electric water heaters (including heat pump units).

Editor's Notes

During our water heaters & part research, we found 306 water heaters & part products and shortlisted 5 quality products. We collected and analyzed 47,088 customer reviews through our big data system to write the water heaters & parts list. We found that most customers choose water heaters & parts with an average price of £20.00.

The water heaters & parts are available for purchase. We have researched hundreds of brands and picked the top brands of water heaters & parts, including Triton Showers, Unvented Components Europe, Primaflow.

Written by
Mohammed Clark Avatar

Mohammed Clark is an architect and a contractor. His architectural skills are not limited to designing the plan for structures alone, but it extends to aesthetics and home décor. Before establishing his firm, he worked under a construction firm for eight years. Mohammed has gathered enough experience from his time practicing as a professional architect and now has vast knowledge in home designs and aesthetics.