1. Pressure production
Cold water of the drain tank is pressurised by a three piston Speck pump.
2. Water heating
The pressurised water is lead by an unloader valve to the boiler, in which it is heated up with oil or gas.
3. Pressure and quantity of water adjustment
Pressure and water are adjusted by an unloader valve. Reducing the pressure, the water flow will be reduced equally, and the unnecessary water is bypassed.