Johnson and Starley boiler and ventilation systems

The Renoxtra range of high efficiency combination condensing boilers from Johnson and Starley features a gas saver module for additional system efficiency.

This re-cycles flue gas heat which is normally wasted and extracts virtually all the energy from the incoming gas supply.

Reclaimed energy is stored in the unit and is used to pre-heat the incoming cold water.

This results in extra domestic hot water (DHW) efficiency, lower gas consumption, running costs and reduced carbon emissions.

RenoXtras are available in 30kW and 37kW models.

Johnson and Starley's central extract systems support the latest version of Part F of the building regulations and the Good Practice Guide 268 for domestic ventilation.

Two multi-spigot systems, one featuring state of the art EC fan technology, as well as an in-line version, will meet specifiers' and contractors' requirements.

The systems are SAP Appendix Q Listed and designed for installation in the roof space or ceiling void.

Their slim design and the ability to mount them in different positions provide flexibility.

All units also have a fan speed controller with option to be mounted remotely and allows ventilation performance to be increased by up to 25 per cent , in accordance with the building regulations.

The C300 and C300 Premier central extract systems are designed for whole house ventilation.

They are multi-spigoted and have 125mm and 100mm spigot options to suit the layout of different dwellings.

The C300 Premier includes an EC fan for energy efficient operation and lower running costs.

It is suitable for highly specified installations while the C180 in-line system is suited for smaller dwellings.

These systems are effective and suitable for many applications and budget, however, when they extract to the outside they also remove heat from the property.

This disadvantage can be overcome through the use of a heat recovery system that uses the heat to warm fresh incoming air which is then supplied back in to the property.

A system of this type removes stale air from a house, replenishes it with fresh air and satisfies Part F of the building regulations, significantly reducing energy consumption and carbon emissions.

Johnson and Starley's SAP Appendix Q listed LE range incorporates EC fans for highly energy efficient operation and lower running costs as they consume only about half the power of traditional AC fans.

In operation, stale and moist air is extracted from wet rooms through grilles or a cooker hood if fitted.

It is passed across an aluminium plate heat exchanger to remove the heat and the residue is exhausted to atmosphere.

Fresh filtered supply air is drawn across the heat exchanger, warmed by the retained heat and distributed through ceiling mounted grilles to dry rooms.

One benefit of using a heat recovery system to satisfy the ventilation strategy, is that the developer or home owner can literally seal the property and insulate to a very high standard.

Once insulated, the dwelling becomes energy efficient and the ventilation is managed by the heat recovery unit to prevent over or under ventilation.

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