Oil Condensing Boiler ,commercial and industrial condensing oil boiler, commercial oil boilers , best quality and price for the UK and IrelandFlexiheat UK

Oil Condensing Boilers – Power Output Range – 69kW – 1,550 kW

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Oil Condensing Boiler -69kW to 1,500kW – up to 9,200kW in Cascade Configuration

Oil Condensing Boiler – The Flexiheat XCK Oil Condensing Boiler is a product of high specification, extensive research and long accumulated experience. The design and its whole construction are a combination of knowledge and experience on our stainless steel condensing oil boilers. The XCK series is at the leading edge of the newest concepts of boiler manufacturing with all internal parts being made of Stainless Steel. A total output of 9,200 kW or 9.2 Mega Watts can be achieved when using these condensing oil boilers in a cascade configuration.

Oil Condensing Boiler Operating Principle

New generation condensing boilers are also called hi-efficiency boilers, because they have been designed and produced thanks to a great technological advancement. Condensing boilers’ principle is based on the exploiting of the heat from exhaust gases through technical solutions taking residual heat and transferring it to cold water entering the boiler. The process seems quite easy, however there is more heat to be exploited: emissions latent heat in the vapour produced during combustion, which is 11%.

With traditional boilers, potential energy on emission gases cannot be recovered and is dismissed in the environment, because the emissions are ejected at temperatures higher than 120°C; on the contrary the condensing boiler principle allows heat recovery from emissions, by cooling them below their dew point, and exhausting them below 65°C.

In this way it is possible to recover the latent heat by the heat exchanger within the boiler, dissipating colder emissions in the atmosphere (50-60°C compared to 120-180°C in a current non-condensing oil boiler) thus respecting the environment. Thanks to Lower Heating Value (LHV) definition which does not include latent heat, so that condensing boiler efficiency exceeds 100% and they have about 25% higher annual efficiency than traditional boilers.

Power Output Range –

This oil condensing boiler series, called the “XCK” has 13 models covers a output range from 69kw to 1,550 KW, in order to choose the most suitable boiler for the different requirements of the oil heating system.

Applications and Standards for Condensing Boiler Oil Fired –

As to Standard EN 303-1 the Flexiheat XC-K Commercial Oil Condensing Boilers are intended for water heating (up to 100°C), for central heating installations, as well as for other similar use. The maximum operating pressure allowed is 6 Bar.


– Firm construction.
– Reliability.
– Energy savings.
– Friendly to the environment
As well as benefiting from –
– Perfect design.
– Easy maintenance.
– Large heating surface.
– Three passes of the burned gases.

Condensing Oil Boiler XCK Range Technical Information

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Oil Condensing Boilers – Technical Data according to the ErP Directive 2009/125/CE – The models with an Output higher than 400 kW are not covered by the directive

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Construction Materials for the “XCK” Oil fired Condensing Boilers –Manufactured in Stainless Steel
• Sheet metal: AISI 316 Stainless Steel
• Seamless tubes: AISI 316, EN 10204
• Gas turbolators: INOX AISI 316
• Door: Carbon steel door with thermal insulation in light cement  -a heat resistant material

Easy Maintenance –

The door of XCK boiler opens to the left or to the right, so that there is easy access to the combustion chamber for cleaning and is also equipped with a PYREX covered hole for easy visual inspection of the flame during operation. The smoke chamber cover is fastened with screws and has a special cleaning opening, which also acts as expansion opening.

Control Panel –

The XCK high efficiency oil boilers are accompanied by a control panel, which is equipped with all the necessary instruments and functions. The control panel includes: general switch, safety thermostat, burner thermostat, water pump thermostat, and thermometer and operation lamps. There is also provision for additional installation of all automatizations of a modern boiler facility for automatic function and energy saving.

Insulation –

The high efficiency oil boilers are insulated with a layer of 100 mm of thermal and acoustic mineral wool insulation material. Carbon steel door with thermal insulation in light cement


XCK Oil Fired Condensing boilers operate with heating oil, in accordance to DIN 51603, with natural gas, or liquid gas according to specifications DVGW of Germany and DIN 4788.

Specifications –

Our oil boilers are manufactured following the German specification DIN 4702. The manufacturing process is based on the European Norm DIN EN ISO 9001, as to the equipment, the manufacture and the control of sub-assemblies, as well as to specialized personnel and the design. The XCK Condensing Oil Boilers have the CE approvals and quality mark.

For more information on this range of oil condensing boilers, please download the brochure and installation manual here

Download XC-K Oil Condensing Boiler Brochure

Download the XC-K Oil condensing boilers installation manual – Flexiheat UK

Oil condensing commercial and industrial use

Should you require anymore assistance or information on our Oil Condensing Boiler range, please don’t hesitate to contact our sales team on 01202 822221 or click here for our email contact form.