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Hamworthy introduces upgraded cast iron condensing boiler

Hamworthy Heating has launched the upgraded version of its customers’ favourite product for refurbishments, the ErP-compliant Purewell Variheat cast iron condensing boiler.

The Purewell Variheat mk2 features the advanced Siemens LMS controls platform, already used in all condensing, pre mix Hamworthy boilers. It allows for easy cascade options controlling multiple boilers and hot water at the same time, providing energy-saving benefits and allowing flexible control regimes for an extended product lifespan. The new version is now also equipped with full spark ignition, updated from the previous hot surface ignitor.

The core of the Purewell Variheat mk2 remains the same: a proven cast iron heat exchanger with large waterways especially tolerant of older heating systems. A 6 bar pressure rating makes the boiler suitable for high rise buildings.

The secondary heat exchanger with copper tube and aluminium fins allows the boiler to condense which means it is not only highly efficient but also compliant with all Building Regulations and the Energy-related Products Directive (ErP). Plus, thanks to low NOx performance (<40mg/kWh, European Class 6), the Purewell Variheat mk2 also scores well on assessments for future-proof heating system design and building performance.

Andrew Dabin, product manager for Hamworthy Heating, elaborated: “The new Purewell Variheat mk2 is a product evolution focussing on longevity, ease of service, control and efficiency. While we looked at impending legislation to not only comply but exceed requirements, reducing especially NOx emissions, we drew on customer experience to improve access for maintenance and handling. Thanks to their feedback, the now full spark ignitor is easier to service without the need to remove the complete burner.

“With additional transport casting lugs at the front of the sump to match the existing rear ones, we’ve made sure movement with a pallet truck is as safe as it can be, whilst preventing damage to the appliance. The controls platform update does not only allow closer control of multiple boilers for improved efficiency, but also gives Hamworthy consistency across the condensing boiler ranges for all gas air pre mix appliances.” 

An electrical socket on the front of the new version aids servicing without power outlets in the plant room, along with front cover hooks for quick and easy removal of the cover. A split mains and low voltage wiring harness reduces potential inaccurate fault codes.

The boilers are compact which makes them easy to transport to and site in smaller plant rooms. They fit on the footprint of the Purewell Variheat mk1 and use the same pipe kits, service clearances and key combustion spares. The mk2 boilers also have the same pipe centres as older, original Purewell boilers which aids replacement. 

The Purewell Variheat mk2 comes with a 10-year warranty on the heat exchangers and is available in five models from 70-180kW of output.

For more information, visit

7 February 2019


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