Zehnder Low Water Temperature Radiators by Zehnder UK

Zehnder Low Water Temperature Radiators

Efficient heating, fit for the future

always the best climate

The UK has set itself ambitious climate targets. To achieve these challenging sustainability goals, it is important that we all do our bit. Numerous international studies show that two thirds of the energy required by private households is used for heating. It therefore makes sense in many respects to heat efficiently and with renewable energies. Zehnder low temperature radiators play an important role in this.

Zehnder Low Water Temperature Radiators

Efficient heating, fit for the future

The heating system is a sensitive complete installation in which all components must be carefully aligned with each other.

In addition to replacing the outdated heating system, it is also essential to upgrade the heat distribution network.

With the rise of sustainable energy solutions, heat pumps have become increasingly popular for heating systems. Unlike conventional boilers, which typically operate at relatively high temperatures (60-80°C), heat pumps are more efficient at lower water temperatures, often between 30-50°C. Therefore, optimum coordination between heat generation and thermal transfer is of fundamental importance.

To effectively distribute heat in a home or building with these low-temperature systems, the choice of radiators is critical. Modern low temperature radiators are an efficient way to save energy. They not only allow you to save energy and costs but also create a comfortable indoor climate.

Future-oriented solutions

Heat pumps work by extracting heat from the air, ground, or water and transferring it to the interior space via a refrigerant cycle. Because they operate at lower temperatures, the radiators used with them must be capable of emitting sufficient heat at these lower levels. Standard radiators may not be sufficient to provide the desired warmth without increasing the size or the number of radiators significantly.

To efficiently heat a space using a heat pump, the radiators need to be optimized to operate with low water temperatures, ensuring they transfer enough heat into the room. Radiators with a larger surface area and constructed using materials with better heat conductivity are crucial for maintaining comfort levels.

Zehnder offers a wide range of radiators perfectly suited for using on or in conjunction with low temperature water systems.

Decorative radiators for electric operation

With electric-only radiators, you always have the right heating system. Electric radiators are not only impressive in functional terms, but they are also an alternative for room extensions where water pipes should not or cannot be installed. Choose a design from the extensive range that best suits your application.

Best for

Spaces that are difficult to connect to the central heating system, occasionally used rooms and areas requiring a quick warm up.

Zehnder Roda

Zehnder Fare Tech

Zehnder Charleston

Zehnder Folio Glass

Zehnder Alura

Fan-assisted decorative radiators

Fan-assisted radiators are ideal for maximum efficiency, even where space is limited. Fans can significantly increase the heat output of a radiator. Quiet, integrated fans with heat exchangers ensure shorter heat-up phases and more power. This results in greater comfort.

Best for

Zehnder Lateo Neo

Zehnder Nova Neo

Zehnder Terraline Neo

Zehnder Stana Neo

Decorative radiators with large surface area

We also supply higher, longer or deeper made-to-measure radiators. Whether panel, multi-column or other styles, our radiators can be custom made for size and output. Zehnder also offers a range of double panel radiators which offer more surface area than standard single-panel radiators. The result of using these radiators is that the room temperature is reached more quickly and evenly, resulting in greater room comfort.

Best for

Buildings with moderate insulation and space for larger radiators.

Large heat output Rapid heating

Zehnder Arteplano

Zehnder Charleston

Zehnder Excelsior

Zehnder Roda

Zehnder Kleo

Zehnder Nova

Double layer tubed towel radiators

With their innovative double layer design, these radiators provide increased heat output and faster towel drying, making them ideal for spaces where warmth and convenience are essential. When paired with low temperature water systems they ensure optimal comfort and functionality. Zehnder’s range of double layer tube towel radiators blend practicality with sophisticated design, perfect for creating cosy, inviting environments.

Best for

Bathrooms and en-suites where warm, dry towels are desired.

Faster towel drying Compact size

Zehnder Zeno

Zehnder Ovida

Zehnder AX Spa

Zehnder Yucca Asym

Supporting heat source

Additional heat sources provide an excellent opportunity to save energy costs and increase comfort in the bathroom, living and working areas. This can be achieved by using an electric heating element with existing radiators in dual energy mode or by using a radiator with an integrated blower.

Best for

Areas where quick, targeted heating, flexibility and comfort are essential.

Faster heat up

Year-round use

Zehnder Forma Air

Zehnder Metropolitan Dual Energy

Zehnder Tetris Dual Energy

Zehnder Roda Twist Spa Air

Aluminium radiators

A common misconception is that aluminium radiators are always better than steel radiators for use in low temperature water systems, such as those connected to heat pumps. Whilst aluminium radiators do heat up and cool down faster due to the material’s high thermal conductivity, steel radiators are often a more suitable choice as they retain heat for longer providing steady, even warmth. Aluminium radiators though do have some advantages. Aluminium radiators are lighter than their steel counterparts resulting lower transportation emissions. This property also makes them easier to handle and install. Aluminium is highly recyclable where up to 95% of the radiator can be recycled. The recycling process also consumes less energy compared to steel, reducing its environmental impact.

Zehnder Lissett

Zehnder Aluminium Blitz Super

Zehnder Aluminium Garda S90

Zehnder Blok

Factors to consider when choosing radiators for heat pumps

Size and heat output

When selecting a radiator for a low temperature water system, it’s essential to ensure that the radiator is sized appropriately for the room it’s heating. Radiators may need to be oversized or use an alternative or supporting heat source to compensate for the lower water temperature.

Most radiator outputs are published at ∆T (Delta T) = 50ºC, which is nominally based on the difference between a room temperature of 20ºC and a mean system temperature of 70 ºC (flow 80 ºC, return 60 ºC). With heat pumps and other lower water temperature systems, the lower flow and return temperatures means that this difference reduces. As a result, the output of the radiator will also reduce. In low temperature water systems, radiator outputs tend to be calculated at ΔT (Delta T) = 30⁰C. Using an online heat output calculator or consulting a heating engineer can help in determining the correct size, number and type of radiators for each room.

We have created a simple tool which can help to calculate outputs at a range of different ΔT

Scan the QR code for more info

Home insulation

The efficiency of any radiator system in a lowtemperature setting is directly related to the level of insulation in the home. Well-insulated spaces retain heat longer, meaning the radiators don’t have to work as hard to maintain a comfortable temperature. Before installing a heat pump system, it’s worth evaluating the insulation of walls, floors, windows, and doors to ensure optimal energy efficiency.

Thermal conductivity of materials

Radiators made from materials with high thermal conductivity, such as aluminium, tend to heat up and cool down more quickly. In some applications this could be required such as in areas requiring a quick heat up response time. However, steel radiators, with their higher thermal inertia, retain heat for longer, providing a more even comfort level.

Conclusion

When transitioning to a heat pump system or designing a low water temperature heating system, selecting the right type of radiator is crucial to maintaining comfort and energy efficiency. Double panel or tubed models, fan-assisted radiators and electric radiators are among the best options for these systems. Ultimately, the best choice depends on the specific heating needs of the home, the insulation level, and the available space.

To maximize the effectiveness of a heat pump system, it is also important to consider insulation improvements and alternative heating options such as electric radiators, which complement low-temperature operations. By carefully planning and choosing the appropriate radiator or heating solution, homeowners can enjoy the full benefits of sustainable, low-temperature heating.

World of Colours Cool colours

World of Colours

Cool colours

Explanation

These colours are finished with a gloss finish; all other colours are matt-finished.

These colours are finished with a gloss finish; all other

are matt-finished.

Some colours and finishes are only available for selected products. Special colour shades on request. Despite extreme care in the production of this colour chart as well as in the painting process of our radiators, slight colour deviations, depending on the production series and compared to other colour carriers (ceramic, paper, metal ...) possible.

Warm colours

Terracotta

Zehnder Group UK Ltd

Concept House, Watchmoor Point, Camberley, Surrey, GU15 3AD

Registered in England: 2296696

Concept House, Watchmoor Point, Camberley, Surrey, GU15 3AD

T: +44(0) 1276 605800 F: +44 (0)1276 24058

Registered in England: 2296696

For placing an order: orders@zehnder.co.uk For technical queries: aftersales@zehnder.co.uk quotes@zehnder.co.uk

T: +44(0) 1276 605800 F: +44 (0)1276 24058

For placing an order and quote requests: orders@zehnder.co.uk

For technical queries: aftersales@zehnder.co.uk www.zehnder.co.uk