Valves Products
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Frequently Asked Questions
What are the main radiator valves types?
The two main types are Manual radiator valves for simple on/off control, and Thermostatic Radiator valves (TRV) for automatic temperature control.
What is a Thermostatic Radiator valve (TRV)?
A TRV automatically senses the air temperature in a room and adjusts the hot water flow to keep the room at a pre-set level.
Why should I buy Thermostatic Radiator valves instead of manual ones?
TRVs save energy by preventing rooms from overheating, leading to potential savings of around
What does the number 3 mean on a TRV setting?
Setting 3 aims for a comfortable room temperature of about 18°C to 20°C, ideal for living spaces.
What is the snowflake or asterisk setting on a TRV?
It is the frost protection setting, keeping the room around 7°C to stop pipes from freezing.
How do I know if my radiator valves are open or closed?
A manual valve is open when turned anti-clockwise. A TRV is open if the room is colder than the set temperature.
What should I do if my radiator is cold but the valve is fully open?
It likely has trapped air (needs bleeding) or the system needs balancing using the lockshield valve.
What is the lockshield valve used for?
The lockshield valve balances the entire heating system and is found opposite the main control valve.
What is the standard pipe size for UK radiator valves?
The standard pipe connection size is 15mm, though older homes may use 8mm or 10mm.
How do I choose between angled, straight, and corner valves?
Choose based on how your pipes meet the radiator; angled valves are common for pipes from the floor.
What makes a radiator valve good quality?
High-quality valves are heavier and made with high brass content to resist corrosion and wear.
What affects the radiator valves price?
Higher prices come from better build quality, premium finishes like chrome, or smart features.
Are manual radiator valves cheaper than TRVs?
Yes, manual valves typically cost less, often between £5 and £35.
Why is my Thermostatic Radiator valve stuck and not heating the room?
The metal pin under the head may be stuck. Remove the head and gently free the pin.
Why do I have a whistling sound coming from my radiator valve?
This usually means water flow is too fast or restricted, possibly from poor balancing or a blockage.
Can sludge block my radiator valve?
Yes, rust and debris can build up inside the valve and stop water from flowing properly.
If my radiator valve is leaking, can I fix it myself?
Minor spindle leaks can often be fixed by tightening the gland nut or adding PTFE tape.
Should I put a TRV on the radiator in the room with the wall thermostat?
No, this can confuse the central heating system and waste energy.
What is the 12°C rule for balancing radiators?
It means adjusting the lockshield valve so water entering the radiator is 12°C hotter than water leaving it.
What are Smart Thermostatic Radiator valves?
They are electronic TRVs controlled through a smartphone or hub, allowing remote scheduling per room.