Specifications

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The eVolution 26 Stove differs from normal boiler stoves in the fact that it can be installed
on an open vented or sealed/pressurised heating system. When installing the appliance on
a sealed system, it is necessary to install added safety features which allow the stove to
be installed safely.
The eVolution has several options regarding water circuit safety. The components used,
and why each is required, are detailed below.
DESCRIPTION OF SAFETY COMPONENTS
SCWS
The SCWS prevents the boiler reaching
100°C. This works by transferring the heat in
the boiler away through a secondary quench
coil situated inside the boiler. The quench coil
is activated by a thermal safety valve (Watts
STS20) which activates at 97°C. The thermal
safety valve needs to be connected to mains
water and drained suitably through an outside
wall, in accordance with G3 regulations.
The Thermal Safety Valve needs to be connected to a mains water supply and then to the
quench coil in the boiler. Both openings are ¾ inch female connections. There should be a
minimum pressure of 1.5 bar mains water supply to the SCWS. The maximum operating
pressure is 8 bar.
IF YOU CANNOT GUARANTEE A SUITABLE WORKING PRESSURE THEN THE
APPLIANCE SHOULD NOT BE INSTALLED
The discharge from the safety coil needs to be
discharged through an outside wall and terminated at
a low level within a 100mm through a metal pipe that
naturally drains. The discharge pipe should be in
accordance with G3 regulations. The thermal safety
valve probe needs to be inserted into the tube and ½
inch tapping in the rear of the boiler.
To ensure correct operation of the thermal safety drain over the
long-term, periodic drainage of the valve is required (at least
once a year); to perform such operation, press the red discharge
button located at the top of the valve head. Such operation allows
cleaning the seal seat where foreign particles build up. After a
certain number of periodic cleaning operations, it is advisable to
replace the valve plug which is supplied as spare part.
MS10-11C Issue 2 14