Diagnosis first, flush second

Customers often come to us after another company has been unable to diagnose a heating problem and has recommended a power flush as the solution. In our experience, the actual problem is usually something else entirely. A flush on a system that doesn't need one is a waste of money. We diagnose the actual problem before recommending any flushing work.

Three types of flush

When a flush is genuinely needed, we use the right method for the situation.

MagnaClean flush

Often the best and most cost-effective approach. The MagnaClean magnetic filter captures debris from the circulating water. When combined with DS40 (an acidic cleaning agent), it can break down and remove stubborn sludge and scale. This is our most commonly recommended method for systems with magnetite problems.

Traditional machine power flush

The original method using a large flushing machine. Rarely required and doesn't work at all on some types of system. We'll only recommend this when it's genuinely the right approach.

Comprehensive flush with new boiler

When we install a new boiler, the system is always flushed. Every radiator is flushed individually. This uses the MagnaClean filter (which we always install with a new boiler) and we hot flush with cleaner, drain down and refill with added inhibitor.

When a flush is needed

Signs that point to a flush

  • Heavy sludge or magnetite contamination causing circulation problems
  • Radiators with stone cold spots in the middle or at the bottom — a sign of sludge build-up rather than just a lukewarm radiator
  • Boiler kettling noise caused by overheating from poor flow
  • Water quality test during a boiler service reveals contamination

Signs that point elsewhere

  • One cold radiator — more likely a valve or balancing issue
  • Boiler cutting out — many possible causes, sludge is just one
  • Another company recommended a flush but couldn't diagnose the fault

Get in touch

We'll diagnose whether a flush is actually needed and recommend the right approach. Call or WhatsApp and tell us what's happening.

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