4 Pipe System
4 Pipe.
Viessmann residential Vitodens system boilers (up to 35 kW) installed together with an unvented cylinder are the perfect combination to meet G3 building regulations without the need for an energy cut-off valve and cylinder overheat thermostat; these are integrated into the boiler.
- By using a 4 pipe installation time will be reduced by up to 1 day as the following are no longer required:
- Energy cut off valve or safety valve
- Expansion vessel and pump
- Gauge and cylinder overheat thermostat*
- Part P certification
A cylinder temperature sensor will be required, see boiler product page Accessories Tab.