Power Flush for Central Heating, Radiators and Boilers

Reduce your gas bill by up to 30% and double the life of your heating system
A flush clears the years of rust and sludge out of your heating system so that it runs as efficiently as if it was brand new. It's like an oil change for your car. You get the oil changed in your car at least once a year. But...


When was the last time you had your heating system power flushed?

What is power flush anyway?

8 signs that your system needs a power flush:

  • Cold spots on your radiators
  • House takes a long time to heat up
  • Shower takes ages to get hot water, or goes hot and cold
  • Rusty spots on your radiators
  • Leaking radiator valves
  • High gas bills
  • Boiler keeps turning on and off
  • Boiler makes a whistling noise like a kettle

Any one of these signs indicates that your system has a build-up of sludge and would benefit from a power flush.

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Why do I need a power flush?

Heating systems rust from the inside
Most people don't realise but the inside of radiators are not stainless steel, so they get rusty. The rust builds up in the radiators and pipes, and also in the boiler.

The rust damages the boiler and makes it less efficient. Rust and sludge clog up the heat exchanger so that the boiler gets less efficient and it damages the boiler's pump and internal parts. This can lead to the boiler cycling on and off, which you will notice as your shower goes hot and cold. Also your gas bill can be very expensive because the boiler is so inefficient. You can easily end up pumping most of the heat outside trough the boilers exhaust.

The rust also damages the radiators. The rusty water is also highly acidic so it dissolves the seals in the boiler and radiators, leading to leaks and drips. Often, so much rust builds up inside the radiators that whole sections of the radiators are completely blocked. If you feel the radiator, you notice that only the top of it gets warm, while the bottom stays cold.

A power flush cleans out the rust and sludge and prevents future rust. When we do a power flush we flush the system with a powerful pump using using a special combination of chemicals that dissolves all the rust and sludge and cleans the system. Then, we put protective chemicals (corrosion inhibitors) into the system to prevent it from rusting in the future. The process requires two people, specialised equipment, and takes a full day.

A power-flush is especially important before you install a new boiler. If you install a new boiler without power flushing the system, then all the sludge from the radiators goes straight into the new boiler and can destroy it very fast. It also voids the warranty. We have literally seen boilers that are 3 months old and already need replacing because sludge and acid are dissolving them from the inside because the installer forgot to power flush the system first.

How much money will a power flush save me?

The three big savings you will make are:

  • cheaper gas bills (£100s saving per year)
  • your boiler lasts much longer (£1000s of saving)
  • your radiators last much longer (£100s of savings)

If your system is filled with sludge, it's much less efficient than when it was new. You can save up to 30% on your gas bill by getting it flushed. That's £100s per year!

A sludge-filled system also drastically reduces the life of your boiler. Imagine particles of rust going through the boiler pump and gumming up all the insides. It's been shown that flushing a system regularly can double the lifespan of a boiler, saving you £1000s.


Do I really need a full power flush?

Well, to be sure that a power flush is required refer to the '8 signs of that you need a power flush' above. If you know that your system has never been flushed before and in doubt you need to get in touch with us as we might advise you to only get your system hot flushed instead of the power flush.The difference is that with a hot flush we only use your existing pump and chemicals to push out the sludge. It is an option if your system has a slight contamination only.

How much does it cost?

  • Hot flush £130 , if your system is fairly new*
  • Power flush £380, if your system has never been flushed*

How often?
- Power flush first time, then hot flush each year when you get your yearly boiler service.

How long does it take?
- 8-9 hours

I have my boiler serviced every year, so I don't need a power flush do I?
The service just checks for noxious gases, but it doesn't mean that the system isn't full of sludge.

*based on average 2 bedroom house