Leaks in heating system systems

Open vented systems

For sealed systems, seek the services of knowledgeable heating engineer

Joints in pipework

Soldered joints which have sprung a leak will got to get replaced. Drain the system and replace the joint by following the section on soldered joints.

Compression joint leaks can sometimes be cured by a small tightening of the nut. Remember to carry the opposite nut with a spanner or wrench to stop pulling the joint from the pipe. Tighten the leaking side a little amount and not quite 1 / 4 turn. quite this and you’ll damage the joint. If this is often not successful, you’ll got to drain down the system and refit the joint. ask compression fittings within the plumbing section.


Radiators can develop pinholes. this is often caused by corrosion thanks to sludge or excessive air stepping into the system. The air promotes corrosion. the sole satisfactory cure is to get rid of the radiator and fit a replacement one. make certain however to flush the system through and identify whether air is stepping into the system. Failure to resolve the cause may mean you’ll get very wont to replacing radiators!

Valve connections

If the valve leaks where it connects to the pipework, you’ll got to repair the joint. The system will be got to be drained down and therefore the joint redone. this is often a compression type joint and relies upon a metal collar referred to as an olive to form the seal when the nut is tightened. For details on the way to make this sort of connection see compression fittings within the plumbing section.

PTFE tape

If the leak is that the other side of the valve where it pops to the radiator, you’ll close both valves and drain just the radiator in question. Whilst you won’t got to remove the radiator, you’ll find details on emptying it within the removing a radiator section. Undo the connection and wind a length of PTFE tape round the joint before reassembling and you’ll find that this may help to seal the thread and stop any leaks. Open the air vent then open just the flow valve. Allow the radiator to fill and shut the air bleed valve when water begins to return out. Now open the return valve.

Radiator connector

Follow an equivalent procedure above to empty the radiator. Disconnect the radiator from the valve first, then use an outsized Allen key inserted within the end to undo the radiator connector. Then clean the thread and wrap a length of PTFE tape around it. Refit the connector to the radiator doing it up with the Allen key, and reconnect the valve.

Air bleed valve Partially drain the radiator in order that the water level inside is a minimum of below the extent of the air bleed valve. Using an Allen key inserted into the valve, you’ll undo and take away it. Clean the thread and wrap a touch PTFE tape around it before reinserting and tightening it copy. Refill the radiator.

Valve body

The gland nut at the bottom of the spindle of a valve sometimes works loose. Holding the valve assembly with a tube wrench to stop it being pulled from the pipework, use a spanner to tighten the nut a touch. If this doesn’t do the trick, it indicates that the gland packing has become worn. close both valves and undo the gland nut. employing a length of special gland packing, wind a couple of turns around the base of the spindle and pack it in tightly employing a small screwdriver. Replace and retighten the gland nut. Open one valve at a time and check again for leaks.

Edinburgh Central Heating Services offer free estimates and range of skills. A 24-hour emergency plumbing service is also offered. For more information visit www.edinburghcentralheatingservice.com or telephone 0131 5102418