Cooling water circulates through the coil in the C-Warm heater
in parallel with the flow through the engine heat exchanger.
Check your engine manual for installation details, or ask your engine supplier.
The instruction manual supplied with C-Warm explains how to
adapt the engine cooling circuit to incorporate the storage
heater.
The temperature of the stored water can approach that of the
water in the engine cooling circuit: 80 deg C or higher. Thermostatic
control may be used to limit the stored water temerature. The
temperature of water available from hot taps should not exceed
65 deg C.
The CW276 cylinder thermostat simply limits the stored water
temperature. The CW272 blender valve adds water to hot, to achieve
the desired temperature, and effectively increases the amount
of hot water stored.