Hot water is an essential part of daily life, whether for residential comfort, commercial facilities, or industrial processes. At the heart of any reliable hot water system lies the immersion heater — a compact yet powerful component designed to deliver efficient and consistent heating. From household storage tanks to solar water boosters and large-scale calorifiers, the right immersion heater ensures not only dependable performance but also safety, energy savings, and long-term durability.
At NTT Heating, we provide a range of immersion heaters that meet different system requirements, budgets, and installation preferences. Our lineup includes:
•Redheat RH-33P (without thermostat)
•Redheat RH-33PT (with thermostat)
•Thermowatt Copper Immersion Heater (Made in Italy, BEAB approved)
Each model is designed with premium materials, tested for compatibility with common storage tanks and solar heaters, and manufactured to ensure ease of replacement and aftermarket installation.
Complete Guide to Redheat RH-33 Series
•Redheat RH-33P – Without Thermostat
The RH-33P is a straightforward and economical solution for water heating needs. Operating at 3KW, 240V, it is constructed from SUS 304 stainless steel and mounted securely with a 2¼” BSP brass boss. This robust build ensures resistance to corrosion, safe installation, and dependable heating performance.
Since the RH-33P does not include a thermostat, it is most suitable for systems that already have external temperature controllers in place, or for applications where continuous heating is desired. It is an excellent choice for users seeking a low-cost replacement element without compromising on durability. It also applies to Calorifier.
•Redheat RH-33PT – With Thermostat
The RH-33-PT builds upon the foundation of the RH-33P by incorporating a built-in thermostat. This feature allows for automatic temperature regulation, eliminating the need for external monitoring. By switching off once the desired temperature is reached, the thermostat improves both safety and energy efficiency, reducing unnecessary electricity consumption while preventing overheating.
Like the RH-33P, it runs at 3KW, 240V, with a SUS 304 stainless steel element and 2¼” BSP brass boss for reliable installation. Its combination of affordability, safety, and convenience makes it one of the most popular choices for households and small commercial setups that need dependable hot water on demand.
Thermowatt Copper Immersion Heater – BEAB Approved Immersion Heaters for Reliable Hot Water
For users seeking another alternative solution with international certification, the Thermowatt Copper Immersion Heater offers advanced features and material flexibility. Operating at 3KW, 240V with the standard 2¼” BSP brass boss, with Copper heating tube — known for its excellent heat transfer properties, copper is the ideal choice for domestic storage heaters and systems with normal water conditions. It ensures fast and efficient heating while keeping costs reasonable.
The Thermowatt Copper Immersion Heaters also incorporates a 2-pole safety cut-out thermostat, which provides maximum protection against overheating. Additional features include silver welding for enhanced durability and British BEAB approval, confirming compliance with strict European safety and performance standards.
These qualities make Thermowatt heaters a trusted choice not only for domestic use but also for demanding applications in hotels, resorts, hospitals, fitness centres, and industrial facilities.
Applications Across All Models
The Redheat RH-33P, RH-33PT, and Thermowatt Copper Immersion Heaters are highly versatile, making them suitable for a wide range of domestic, commercial, and industrial applications. In households, they are commonly used in storage tank water heaters, providing reliable hot water for daily activities such as bathing, cleaning, and cooking. In solar water heating systems, these heaters act as dependable boosters, ensuring a steady supply of hot water during cloudy days or periods of low sunlight.
For commercial environments, immersion heaters are essential in facilities such as hotels, resorts, hospitals, fitness centres, and clubhouses, where there is a constant demand for large volumes of hot water for guest rooms, kitchens, laundry services, and sanitation purposes. Beyond these uses, they can also be applied in general liquid heating for light industrial processes, such as cleaning systems, food preparation, or equipment maintenance. Their adaptability makes them a practical solution across many sectors.
Customising the Right Model for Your Needs
At NTT Heating, we understand that different systems and water conditions require different solutions. That is why we not only supply ready-made immersion heaters but also customise the heating tube material according to your requirements. Customers can choose between Incoloy 800 for better corrosion resistance in hard or harsh water, or Copper for faster heat transfer in normal water conditions.
Unlike Thermowatt, which only offers copper tube options and comes at a higher price, our NTT-made Redheat RH-33 series provides greater flexibility at a more competitive cost. This means you get the same reliable performance with the added advantage of choosing the material that best suits your system and budget.
With NTT’s local manufacturing, you enjoy:
•Custom material selection (SUS304 or Incoloy 800)
•Affordable pricing compared to imported brands
•Compatibility with Pecol and Solarmate systems
•Faster availability with ready stock and local support
By producing our own range of Redheat RH-33 series heater locally, NTT is able to offer several key benefits to customers. First, we ensure better cost savings. Second, we maintain ready stock, allowing for faster replacement and less downtime when hot water systems require servicing. Finally, our ability to customise material options gives users more flexibility, which often limit choices to standard copper elements. This combination of affordable pricing, flexible design, and local support makes NTT a reliable partner for both
installers and end-users. Customers can be confident that every immersion heater supplied by NTT is designed for long service life, safe operation, and consistent heating performance. This ability to tailor the heater element ensures that whether you are replacing an existing part or installing a new system, you get the right balance of quality, durability, and cost-effectiveness.
Conclusion
By offering a comprehensive selection of immersion heaters, NTT Heating ensures there is a solution for every type of user — from households looking for a cost-effective replacement element to large facilities requiring high-performance, safety-certified heaters.
Whether you opt for the Redheat RH-33P, RH-33PT, or Thermowatt Copper Immersion Series, you can be assured of consistent hot water supply, energy efficiency, and long-lasting durability. With the right immersion heater, your hot water system becomes safer, smarter, and more reliable for years to come.
