The Dunsley Neutralizer
Trouble free way of interlinking two or more boilers
The use of a Neutralizer offers a neat solution to the problems of link-up. The description 'Circuit Neutralizer' (also referred to as a neutralising vessel or chamber), is intended to convey the fact that the Neutralizer fixes the neutral point location within the heating system. The cold feed and open vent are both connected to the heating system at the neutralising chamber. Provided both boilers are only connected through this point, then pumped or gravity circuits connected to the chamber can have no hydraulic interaction. This means that the pumped circuit from a gas or oil fired boiler will not induce flow through a solid fuel boiler via its gravity circuit. The solid fuel boiler will however feed hot water into the system, thus achieving the desired objective.
