About Thermrad – frequently asked questions

The radiator (system) has not been deaerated correctly. If the central heating system contains too much air, then the radiator will make a gurgling sound.
At the bottom-connections of the Thermrad Super-8 radiator the inlet and outlet connections have been reversed. Seen from the front of the radiator (both middle-connections and bottom-connections on the right side) Inlet = Left / Outlet = Right. In radiator types 20, 21, 22 or 33, only the back of the radiator becomes warm and a rattling sound is frequently heard from the radiator insert.
The system pressure is too low. For standard residential systems, the pressure should be between 1.5 – 2 bar. For high-rise buildings, such as flats, this should be between 2 – 5 bar.
The system has not been (correctly) tuned up. Because the radiator valve has been set to an incorrect Kv-value, the flow through the radiator and/or system is incorrect.
The radiator or the radiator valve is blocked. By shutting off the other radiators, it is possible to test whether the relevant radiator heats up.

• The central heating system operating pressure is too high. Reduce the pressure, or lower the position of the system pump.
• System in combination with district heating. A special thermostatic radiator insert is required when connected to district heating.
• The radiator insert has been incorrectly configured. Remove the radiator valve cap and turn the pre-setting on the radiator insert to increase the flow, for example set it to position 4 or 5.
• The radiator valve has been closed (too far).
• The radiator valve is not suitable to use in combination with the radiator insert. Replace it with a Thermrad radiator valve.

• Noises that are caused by the pipes expanding and contracting travel through the system to the radiator, which then acts as a “sound amplifier”. Sound transmission is greatly reduced by using fixing brackets with rubber inserts or by installing aluminium/plastic pipes.
• The soundproofing plastic caps on the radiator brackets have broken off.
• Aluminium AluBasic and AluStyle type radiators must be mounted “freely” in the brackets. Sound transmission can be reduced by slightly loosening the fixing bracket screws. Alternatively, the noise can be reduced by using an extra fixing bracket with a soundproofing insert.

In damp areas, such as bathrooms, a small amount of damage to the paintwork can cause corrosion of the steel radiator. Prevent damage by using the right tools when fitting the radiator valves and valve caps. It is easy to prevent rust by treating the connections of the towel radiator with a touch-up paint pen.

With most other radiators that have a flat design, the front panel is glued to the radiator. The Thermrad Super-8 Plateau has a removable front panel. If the radiator is damaged during use, the front panel can be replaced without the need to disconnect the radiator from the pipes. The front panel can be reattached using separate clips and ultra-strong magnets. This design also has the advantage of adding a luxurious appearance to Thermrad Super-8 compact by replacing the ribbed front panel with a flat design. Separate front panels are not available for vertical radiators in the Thermrad Vertical range.

The flat front panels of the Thermad Super-8 Plateau and the Thermrad Vertical are fitted to the radiator with ultra-strong magnets. Where the magnets are attached to the front of the radiator, dust and metal particles can appear. These are easy to remove with a dry cloth.

If a top-grill or side-panel is damaged, it can easily be replaced. The spare parts for Thermrad Super-8 en Super-8 Plateau are the same. (type nr: 1492……..). For Thermrad Compact-4 and Compact-4 Plateau radiators, there is a different range of spare parts available (type nr: GRILL-…… and SIDECOVERS-…….)

Thermrad Super-8 / Plateau radiators are delivered including self-locking L-brackets. The dimensions of these L-brackets make sure that the middle-connections of the radiator are placed exactly 66mm from the wall. If a bracket is missing, it can be replaced with brackets for type 11 radiators (type nr: 149215025) and for type 21-22-33 radiators (type nr: 149215026).
Thermrad Compact-4 / Plateau radiators are delivered including standard L-brackets. For replacement of the brackets, type nrs WH300 through WH900 should be used.

Each Super-8 radiator is delivered with a separate thermostatic insert valve. The standard pre-setting is fully open (position 6). When tuning the heating system it can improve comfort and reduce energy consumption if the pre-setting of the insert is adjusted to the size and position of the radiator in the heating system. The Kv-value of each of the 6 pre-setting positions is mentioned in the instruction, packed with the insert.
An overview of our standard pre-set recommendation, bases on the size of each radiator, can be found on the download-page of the Thermrad website.