30% of the volume is dedicated solar capacity, and 70% volume can be heated in the normal way via a primary coil on days when solar input is not sufficient to heat the full contents of the unit or on days when additional energy is required.

Two control thermostats are used to maximise solar gain. The upper one is used for boiler control (not supplied). The lower one is for solar control (not supplied). The upper 1/2" female boss (G) is for a temperature gauge (not supplied).

The range shows seven popular sizes and capacities. When calculating the size required, please ensure that the upper coil volume is used for total requirement. If the application is for a twin bath, for example, at least 145 litre of 'upper coil' volume is required so that this demand can be catered for on winter days.

The range shown here has a Part L complaint upper coil fitted.

Dimensions:

Height                 1200     1200     1500     1350     1500     1800     1800
Diameter              400       450      400       450       450      450       500
Capacity (Litres)   131       160      166       180       206      250       300

* All dimensions are in mm.