Merrist Wood College, part of Active Learning’ is a 400-acre award winning institution specialising in land-based industries. Located near Guildford, it is widely recognised by industry specialists for its training and multiple successes at the RHS Chelsea flower show.

In early 2020 it was concluded that the existing oil fired boilers serving one of the college buildings were replaced with a more efficient alternative. Designed and skilfully installed by Hampshire based contractor, Aster Building Services Ltd, the replacement equipment included three Ethos 70kW condensing boilers with a combined modulation of 20 > 1. Each boilers integral pump shunts the primary water to a Mikrovent 400 low loss header/air dirt separator that’s capable of filtration of sediment as small as 5 microns.

Supplying heat to a mixture of classrooms, laboratories and admin areas, the new plant was unvented by way of a pre-commissioned pressurisation package. This included the Mikrofill 3, system expansion vessel and service drain valve.

For more information on these and other Mikrofill products, please contact the sales team on 03452 606020 or visit