K260 & K340

Please note that this product is no longer available and the information below is for reference only.

Keston Boilers have launched two commercial condensing gas boilers to further extend our existing range of ultra-high efficiency domestic and commercial boilers.

The Keston 260 (76kW) output and Keston 340 (100kW) output are unique in concept and design and each have an exceptionally high efficiency at 98% gross.

Despite their powerful output, the boilers are designed to be wall mounted, though floor standing installation can be accommodated by using the optional floor standing frame. The compact size means the new Keston boilers can be sited practically anywhere without the need for a dedicated boiler room.

Each model comprises two boiler modules with individual gas valves, fans, burners and heat exchanger assemblies. Each module operates completely independently and is automatically sequenced to offer optimum load matching.

Firing sequence is regularly rotated automatically to even usage levels.

Unique Flue System

All Keston boilers have the advantage of a small diameter plastic flue system and the two new models are no exception. The 100mm (4") diameter plastic flue can be extended up to 39 metres away from the unit, either vertically or horizontally, and can save thousands of pounds on installation costs when compared to a conventional flue. In refurbishment projects there is no need for expensive re-lining of the flue. The system is also ideal for buildings with difficult flue options and particularly listed buildings with various restrictions.

An added benefit of the flue system is that the boilers can be sited practically anywhere and in the most convenient position.

How It Works

The Keston modules use a high powered combustion blower to deliver a pre-mix of gas and air to a downward firing burner in a high efficiency single pass heat exchanger. The heat exchanger is made from highly corrosion-resistant stainless steel formed into a tightly wound coil. Hot combustion gases from the burner pass through the coil providing heat to the water system.

Integral shunt pumps within the appliance cabinet ensure each module receives the correct water flow when firing.

The Keston boilers are of low mass and low water content giving a rapid response when there is a call for heat.

The design of Keston boilers, with its single pass heat exchanger, avoids the complications associated with other condensing boilers and, as a result, does not need complicated printed circuit boards. The unit is totally room sealed and requires no ventilation to the room or compartment in which it is installed for combustion air.

These two new boilers are exceptionally easy to install and maintain and include pipework header assemblies to assist speedy installation. They are completely environmentally sound with negligible NOx emissions of around 5ppm (parts per million) and can save up to 30% on the heating bill.

Practically any Heating Output

Because of its modular design, the Keston lends itself to almost any required heating output by way of multiple unit installations for larger commercial or industrial applications, and the benefits over a single commercial boilers are immense. The Keston modular system is perfect for decentralisation programs now happening in many commercial installations,, such as hospitals and universities, where one large commercial boiler is being replaced.

From initial purchase through to installation and maintenance, the Keston saves money, time and aggravation.

In most commercial applications, the Keston modular system has proved to be far less expensive to buy or install than the equivalent output single commercial boiler.

The Highest Standards

All Keston boilers carry the CE Mark, are British Gas Approved and Service Listed and manufactured to ISO 9001 international certification.

The long life heat exchanger is made from exceptional quality high alloy stainless steel and carries a three year guarantee.