Specifications

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Boiler installations should only be carried out by qualified heating engineers who
hold a HETAS wet systems certificate or equivalent. Installations incorporating the
SCWS (Safety Cold Water System) should ONLY be carried out by those engineers
who have completed the SCWS training course or an equivelent Biomass training
course.
If connected to an unvented heating system, this appliance must (as a minimum) have the
following components installed on the system to ensure the safe operation of the
appliance:
1) WATTS STS220 – Thermal discharge Valve (supplied)
2) WATTS KSG 30 – Safety Pressure Relief Valve (supplied)
3) Expansion Vessel comprising 7% of the total system volume (not supplied)
4) If connected in conjunction with a Gas Combination Boiler you will need a “Low Loss
Header” to link the boilers together; this will ensure that there is no conflict between the
two boilers. The low loss header should be sized and provided by the heating engineer.
MS10-11C Issue 2 13