General Maintenance Tips

Silent, deadly, costly... corrosion begins the moment water enters a heating system. When the water is hot, corrosion attacks with greater speed.

Corrosion is generally caused by the presence of oxygen, but can also be brought about by galvanic effects which occur when different metals are connected. Aluminium is especially prone, and for this reason should never be connected directly to copper or brass.

When corrosion occurs, black magnetite is formed which can restrict circulation in radiators, cause premature pump failure, and form deposits in heat exchangers which manifest themselves in boiler noise and lost efficiency.

Gassing, another side-effect of corrosion, requires radiators to be bled in order to restore circulation.

Pin-hole corrosion can give rise to alarmingly rapid perforation and loss of radiators. It is normally due to over-use of flux and lack of effective flushing in new systems.

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