Best Water Heaters & Parts of 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
Top 10 Water Heaters & Parts
Triton SPT303I T30I Handwash Water Heater
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.
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.
iropro 18L 36KW LPG Instant Water Heater
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.
Inlet Control Multibloc Valve with 3 Bar Pressure
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.
Vaillant Ecotec Expansion Vessel and Pressure Relief Valve Bundle
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.
Horstmann Electronic 7 Immersion Heater Controller
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.
TESY 80 Litre Hot Water Cylinder
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.
Bellanny 1.5KW Instantaneous Water Heater
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.
Triton Showers 9.5 KW Electric Shower
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.
Adjustable Pressure Reducing Valve with 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.
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).
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.

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.