The NIBE S735C is an intelligent inverter-controlled exhaust air heat pump with an integrated water heater, providing heating, cooling, hot water and ventilation efficiently and economically.

With active cooling built in, the S735C is capable of keeping the indoor temperature down during the hot summer period, and will also assist with Part O compliance. The heat pump automatically adapts to the dwelling’s heating demands, offering potential for high energy savings. The S735C uses a natural refrigerant (R290) for a sustainable footprint, putting less strain on the climate and nature.

The NIBE S735C has a high seasonal performance factor, which results in low operating costs. A low noise level, stylish design with a touchscreen controller, and compact size make it perfect for smaller modern properties & allows for simple installation. The S735C is designed for new build properties, and the addition of the NIBE SAM S42 supply air module gives an option for when balanced exhaust and supply air ventilation is required.

Part F Compliance

Part F of the Building Regulations 2010 requires all new build properties to have satisfactory ventilation.

There are four main criteria to be compliant with Part F:

• Sufficient extraction of vapour and pollutants from areas of significant production, e.g. bathrooms & kitchens
• Ensure a minimum level of fresh outdoor air is supplied to occupants
• Rapidly dilute any pollutants and water vapour
• Minimise the entry of air pollutants

NIBE exhaust air heat pumps are classed as MEV products, therefore follow the guidance in section 1 of Part F regulations.

This means NIBE Exhaust Air units currently offer a solution to meet Part F regulations, while also providing heating and hot water, unlike traditional ventilation systems.

Part O Assistance

Part O of the Building Regulations 2010 aims to reduce the occurrence of overheating in residential buildings.

Heat reduction can be categorised in two strategies:

Simplified Method

Dynamic Thermal Modelling

One of the above methods will need to be undertaken to calculate overheating potential of the building, and to then design the building to minimise the chances of overheating. This would happen by using natural shading (trees) or mechanical shading (blinds)

The S735C can offer a solution by reducing the internal temperature of the building.