Central Heating Maintenance

Power Flush Central Heating System

How do you know when to Power Flush your radiators?

Over time, your central heating can become clogged up and blocked, reducing the overall efficiency and reliability. This will be costing you more in heating bills

Alex has years of experience working in the trade both commercially and domestically

When is it Normal for a Radiator to be Cold Underneath?

Radiators are naturally warmer on the top than the bottom, some radiators more than others. ‘Convection radiators’ focus on convection heating and convection heating is when the heat rises and pushes cool air downwards. This cool air is heated, and the cycle continues. But all radiators use a combination of both convection heating and simply ‘radiating’ their heat out.

As a result, all this means is that every radiator is going to be cooler at the bottom, Some radiators more than others. But no radiator should be cold at the bottom.

When is it Not Normal for a Radiator’s Bottom to be Cold?

If your radiator is hot at the top and cold at the bottom, then it’s producing less heat than it should.

Hot & Cold Spots: 

Another sign that your system is becoming clogged up is cold spots on your radiator. This is again due to sludge building up in your radiator preventing the water from circulating. This can also result in uneven heating within your rooms

What Is sludge?

Sludge is tiny fragments of metal and dirt. As time goes by your radiator and system will rust and sludge will start to build-up.

Sludge can seriously clog things up preventing the water from flowing around freely. This will make your boiler work harder and your system weaker.

When to Flush a Radiator?

The Sludge Test

1. Noisy boiler

2. Radiators take longer to heat up

3. Cold spots on the radiator

4. Radiators require bleeding more often

5. When you bleed the radiators, the colour of the fluid is:

  • Clear: you’re safe, champ. You probably just needed to bleed them.
  • Slightly brown: Sludge is starting to build up. An ideal time to flush.
  • Very dark brown: You must flush. And quickly. Hopefully, you don’t need to power flush.


Is Power Flushing a new radiator required?

Flushing new radiators shouldn’t really have to happen. Finding cold spots on a new radiator may mean that the boiler system already has some nasty sludge in it. This could have contaminated your new radiator.

Is your Radiator 5 Years Or Older?

If you want to keep your system in tip-top condition then power flushing every 5 to 6 years is a good idea.

You should be able to get away with power-flushing your radiators every 8 to 10 years depending on the quality of the materials used in your system.

How do you know if need to Power Flush Central Heating?

All you need to do is regularly feel the bottom of your radiators, especially if a room just isn’t heating up as it should. If there are cold spots, then it’s possible you have sludge in your radiator that needs flushing.

6 Reasons Why You Should Power Flush Radiators?

  1. Quicker heating radiators
  2. Heating costs will be lower
  3. Rooms heated more evenly
  4. Longer lasting system
  5. Avoid expensive power-flush further down the line
  6. Safer boiler, because replacing a boiler isn’t a small task

Central Heating Filters

Magnetic filters are great to ensure the health of your system over an extended period. They attach to your boiler and as the water runs through, the fragments of metal are grabbed by the magnet preventing build-up elsewhere. They are easy to install and can reduce your annual heating costs by up to 6%

If Your Are Interested In a Power Flush

If you feel your central heating system would benefit from a power flush, or you have some symptoms of hot and cold radiators, then please contact us for a free no-obligation quote to sort out your system


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