Keston C35 35kW Condensing Combi Boiler

Keston C35 35kW Condensing Combi Boiler

Keston C35 combi boiler

The Keston C35 Combi Boiler is a compact 35kW wall-mounted gas condensing combi boiler designed to provide central heating and domestic hot water from a single appliance. Its compact design, fully modulating operation and flexible twin-flue capability make it suitable for a wide range of domestic heating installations.

The Keston C35 provides a maximum 35.3kW domestic hot water output and a DHW flow rate of approximately 14.5 litres per minute at a 35°C temperature rise. It is designed to deliver heating and hot water without requiring a separate hot water storage tank.

35kW Heating and Hot Water Performance

The C35 is designed for applications requiring strong domestic hot water performance. Its maximum DHW output is 35.3kW, while the maximum central heating output is 25.6kW at 40°C flow temperature and 24.2kW at 70°C.

The DHW flow rate reaches approximately 14.5 L/min at a 35°C temperature rise, providing a strong hot water supply for typical domestic applications.

A-Rated Condensing Efficiency

The Keston C35 is a condensing boiler with an A-rated seasonal space-heating efficiency class. Manufacturer documentation lists seasonal space-heating efficiency of 91.1% under the older SEDBUK 2005 methodology and 89.6% under SEDBUK 2009.

Its fully modulating operation allows the boiler to adjust its output according to heating demand, helping provide efficient and consistent operation.

Compact Wall-Mounted Design

The Keston C35 is designed to make installation easier where space is limited. Manufacturer documentation gives dimensions of approximately 700mm high × 395mm wide × 278mm deep, with a maximum installation weight of approximately 31.5kg.

Its compact dimensions make it suitable for installations where a discreet wall-mounted boiler is preferred.

Flexible Twin-Flue Installation

One of the key advantages of the Keston C35 is its twin-flue capability. The Keston Combi range can be installed using the Keston Twin Flue System, allowing greater flexibility over where the boiler can be positioned.

Depending on the flue configuration, the manufacturer’s specifications allow significant flue lengths, helping installers overcome some of the positioning restrictions associated with conventional concentric-flue boilers.

Heating and Hot Water from One Appliance

As a combination boiler, the Keston C35 provides both central heating and domestic hot water without requiring a separate hot water cylinder or storage tank. Keston describes the Combi range as a single-appliance solution for home heating and hot water.

This makes the C35 particularly useful for domestic installations where space-saving design and on-demand hot water are priorities.

LPG Conversion Available

The Keston C35 can be adapted for LPG operation using the appropriate LPG conversion kit. This provides additional flexibility for properties that do not have a natural gas supply.

Installation and conversion should always be carried out according to the manufacturer’s instructions and applicable local regulations.

Keston C35 Specifications

Specifications are based on Keston manufacturer documentation and should be checked against the exact model and installation requirements before ordering.

Frequently Asked Questions

What is the Keston C35?

The Keston C35 is a 35kW wall-mounted gas condensing combi boiler providing central heating and domestic hot water from one appliance.

What is the DHW output of the Keston C35?

The Keston C35 has a maximum domestic hot water output of 35.3kW.

What is the Keston C35 hot water flow rate?

The C35 provides approximately 14.5 litres per minute at a 35°C temperature rise.

Is the Keston C35 a condensing boiler?

Yes. The Keston C35 is a gas-fired condensing combi boiler with an A-rated seasonal space-heating efficiency class.

Does the Keston C35 require a hot water cylinder?

No. As a combi boiler, the C35 produces domestic hot water directly without requiring a separate hot water storage cylinder.

Can the Keston C35 run on LPG?

Yes. An LPG conversion kit is available for the Keston C35, subject to the applicable installation requirements.

What are the dimensions of the Keston C35?

The manufacturer lists the C35 at approximately 700mm high × 395mm wide × 278mm deep.

Is the Keston C35 suitable for replacement installations?

Yes. Keston describes its Combi C30 and C35 boilers as suitable for both new and replacement installations.

Can the Keston C35 be supplied to European customers?

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