Best Water Heaters & Parts of 2025

Mohammed Clark Avatar
Mohammed Clark
Last Updated: 31 Jan 2025

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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 SPT303I T30I Handwash Water Heater Cover #TOP 1
Triton SPT303I T30I Handwash Water Heater
ftb score rating icon 9.8
TCP Smart Down Flow Ceramic Heater 2000w Cover #TOP 2
TCP Smart Down Flow Ceramic Heater 2000w
ftb score rating icon 9.7
iropro 18L 36KW LPG Instant Water Heater Cover #TOP 3
iropro 18L 36KW LPG Instant Water Heater
ftb score rating icon 9.5

Top 10 Water Heaters & Parts

#TOP 1

Triton SPT303I T30I Handwash Water Heater

SPT303I
White
Triton SPT303I T30I Handwash Water Heater Cover
Triton Showers SPT303I T30I handwash Water Heater, White

The Triton T30I Water Heater is designed to provide instant hot water on demand, making it perfect for handwashing in areas where only cold mains water is available. With a single control for start/stop and temperature selection, you can easily adjust the water temperature to your preference. Its quick and easy installation ensures you can set it up without hassle. Additionally, it serves as a direct replacement for the Triton T30I, offering a seamless upgrade for existing users.

What We Like
Instant hot water supply
Easy to install
Single control operation
Ideal for cold water supplies
Direct replacement for T30I
#TOP 2

TCP Smart Down Flow Ceramic Heater 2000w

SMAWHHEAT2000WHOR705
White
TCP Smart Down Flow Ceramic Heater 2000w Cover
TCP Smart Down Flow Ceramic Heater 2000w

The TCP Smart Heater is designed for convenience and safety. With an IP21 rating, it is perfect for use in bathrooms and home offices, ensuring it can withstand moisture. The child lock feature adds an extra layer of safety, making it ideal for families. You can control the heater easily with the electronic thermostat and remote control, allowing you to adjust the temperature without getting up. Additionally, the TCP Smart App enables voice control through Alexa and Google Home, giving you the flexibility to manage your heating with ease.

What We Like
Safe for moist environments
Child lock feature
Remote control convenience
Voice control compatibility
#TOP 3

iropro 18L 36KW LPG Instant Water Heater

O2009006ZH
Silver
iropro 18L 36KW LPG Instant Water Heater Cover
LPG Hot Water Heater, Stainless Steel 18L 36KW Instant Water Heater Boiler for Home Apartment Camping Outdoor Garden Use w/Shower Kit

The iropro Hot Water Heater offers a powerful 36 KW output, ensuring you receive up to 18 litres of hot water per minute. With six protection features, including over-temperature and low water flow safeguards, you can enjoy a safe and reliable shower experience. Its stainless steel and copper construction guarantees durability and resistance to rust, making it ideal for outdoor use. Additionally, the intelligent switch control allows you to easily adjust the temperature, enhancing your convenience and comfort while using this heater.

What We Like
High thermal efficiency
Easy temperature adjustment
Durable stainless steel design
Portable and lightweight
Fast heating for various uses
#TOP 4

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 Valve

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
#TOP 5

Vaillant Ecotec Expansion Vessel and Pressure Relief Valve Bundle

181051 178985
Vaillant Ecotec Expansion Vessel and Pressure Relief Valve Bundle Cover
Vaillant Ecotec Expansion Vessel 181051 Bundle with Vaillant Ecotec 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 6

Horstmann Electronic 7 Immersion Heater Controller

Electronic 7
Multi
Horstmann Electronic 7 Immersion Heater Controller Cover
Horstmann Electronic 7 Water Heater, Multi

The Horstmann Electronic 7 Controller is designed for efficient management of "off peak" water heater installations. This product ensures you benefit from lower energy costs by utilising off-peak electricity. Its automatic clock feature adjusts seamlessly between GMT and BST, so you don’t have to worry about changing the time manually. This convenience means you can enjoy hot water when you need it without any hassle. Overall, this controller simplifies your water heating experience and helps optimise energy usage.

What We Like
Energy cost savings
Automatic time adjustment
Easy to use
Efficient for off-peak times
#TOP 7

TESY 80 Litre Hot Water Cylinder

TESY Electric Water Cylinder
TESY 80 Litre Hot Water Cylinder Cover
Tesy Hot Water Cylinder (80 Litre)

The TESY Hot Water Cylinder features a glass ceramic coating, ensuring durability and resistance to corrosion. Its patented piston effect allows for efficient control of refilling, helping you manage your hot water supply effortlessly. With frost protection, you can be assured that your cylinder will function properly even in colder conditions. Additionally, the wall mounting option saves space in your home, making it a practical choice for any household.

What We Like
Durable glass ceramic coating
Efficient refill control
Frost protection feature
Space-saving wall mounting
#TOP 8

Bellanny 1.5KW Instantaneous Water Heater

Bellanny
ES0320400
White
Bellanny 1.5KW Instantaneous Water Heater Cover
Bellanny Mini Electric Water Heater, 1.5KW 220V Electric Instantaneous Water Heater with 10L Water Tank, IP4X Waterproof Under Sink Water Heater with LCD Digital Display & Temperature Knob, UK Plug

The Bellanny Water Heater offers fast heating, ensuring you never have to wait for hot water again. You can enjoy an on-demand water supply, whether you’re washing your hands or doing dishes. Made from quality stainless steel, this compact unit is designed to last, adapting to various water qualities. Additionally, it prioritises safety with features like dry burn prevention and over-pressure protection, giving you peace of mind while using it in your home.

What We Like
Fast heating technology
On-demand hot water supply
Durable stainless steel design
Safety features included
Compact and flexible installation
#TOP 9

Triton Showers 9.5 KW Electric Shower

MOSV09SG
White
9.5 KW
Triton Showers 9.5 KW Electric Shower Cover
Triton Showers MOSV09SG Seville Universal Electric Shower, White, 9.5 KW

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 10

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
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 10 quality products. We collected and analyzed 27,656 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 £30.94.

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, TCP Smart, iropro, Unvented Components Europe, Horstmann. The seller of top 1 product has received honest feedback from 819 consumers with an average rating of 4.8.

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.