ESBE load valves

VTC thermostatic valves are 3-way thermostatic valves. Installed close to the boiler stove or log gasifiyer the load valve protects the boiler from low return temperatures, improves efficiency and accumulator loading. When the water in the stove boiler is still cool the valve directs the water straight back to the stove. This means that the volume of water which the stove initially has to heat up is small and so it heats it up quickly.

When the water hits 60ºC the valve starts to open and lets a little of the water from the central heating return pipe into the boiler circuit, which of course lets a little hot water out into the central heating flow pipe. The valve gradually opens until by the time the water has reached 70ºC it is fully open and all the water is pumped into the central heating circuit. So in this way using a VTC series thermostatic valve gets the stove boiler up to temperature fast and keeps it there. This prolonges the life of the boiler, makes the stove work more efficiently, and reduces unnecessary mixing in accumulator tanks - because on hot water is allowed out into the main heating loop.

These load valves are not suited to thermosyphon systems and the return from heat leak rads must be plumbed in between the stove and the valve. Your installer might also consider fittin a thermosyphon bypass.