Sludge in the Central Heating System
Cool patches at the bottom of radiators, black water when bled, and a boiler that struggles in cold weather..
Cool patches at the bottom of radiators, black water when bled, and a boiler that struggles in cold weather.
What is actually going on
Cool patches at the bottom of radiators, black water when bled, and a boiler that struggles in cold weather.
The realistic causes, in order
Magnetite formed by internal corrosion where inhibitor has been lost or diluted Fresh water repeatedly added to a leaking system, bringing dissolved oxygen with it A mixed-metal system with no filter, so debris circulates into the boiler
What we test on site
A water sample tested for inhibitor level and iron content Radiator surface temperature mapping to show where deposits have settled Filter presence and condition, plus pump and heat exchanger for accumulated debris
Get sludge in the heating system diagnosed properly
A clean plus a magnetic filter and correct inhibitor dose protects the boiler and restores output.
Questions we get asked
Why does sludge in the heating system affect some radiators and not others?
Magnetite formed by internal corrosion where inhibitor has been lost or diluted
What normally puts sludge in the heating system right?
A clean plus a magnetic filter and correct inhibitor dose protects the boiler and restores output.
Is it safe to keep using the system with sludge in the heating system?
Chemical cleaning and power flushing use different equipment and suit different systems. The right one depends on the system's condition, not a fixed sales script.