Purewell VariHeat single boiler
The only ErP compliant Cast iron condensing, fully modulating, pre-mix gas fired commercial boiler. 

Available in 5 models with outputs (@50/30°C) of 70, 95, 110, 140 and 180kW.
  • Proven reliability with a 10-year heat exchanger warranty. Non complicated design means the Purewell VariHeat is easy to operate & maintain, saving on time and money. 
  • Can be supplied unassembled for plant rooms with difficult access.
  • Tolerant of existing heating systems making the Purewell VariHeat the perfect choice when replacing old atmospheric boilers.
  • Highly efficient offering up to 96% gross seasonal efficiency, reducing carbon emissions and saving the end user money on fuel bills. 
  • Fully factory tested before delivery. 
  • Sits on same footprint as many traditional and atmospheric boilers reducing space concerns.
  • Easy access to plant room as the Purewell VariHeat fits through a standard doorway.
  • BIM objects available to assist in project design and management.
  • Buy in confidence from a UK manufacturer with decades of commercial heating and hot water expertise.
  • Extensive back up and support from our team of experience engineers across the UK.
Contact your nearest Hamworthy sales representative to discuss your requirements or make an enquiry online.
  Title Type Size  
Purewell VariHeat C brochure Purewell VariHeat C brochure Product brochures 2355 kB Download
Purewell VariHeat C dimensions Purewell VariHeat C dimensions Dimensions 839 kB Download
Purewell VariHeat C technical data table Purewell VariHeat C technical data table Data tables 547 kB Download
Purewell VariHeat C manifold kits installation manual Purewell VariHeat C manifold kits installation manual Installers guides 2187 kB Download
Purewell Variheat condensing installation manual Purewell Variheat condensing installation manual Installers guides 6574 kB Download
Purewell VariHeat condensing user instructions Purewell VariHeat condensing user instructions Installers guides 137 kB Download
QAA73.210 Programmable room unit for single boiler applications user manual QAA73.210 Programmable room unit for single boiler applications user manual Installers guides 778 kB Download
QAA73.210 Programmable Room Unit Installation Manual QAA73.210 Programmable Room Unit Installation Manual Installers guides 867 kB Download
Purewell VariHeat condensing seasonal efficiency sheet Purewell VariHeat condensing seasonal efficiency sheet Seasonal efficiency sheets 109 kB Download
Purewell VariHeat scheme 1 open vented with low loss header Purewell VariHeat scheme 1 open vented with low loss header Hydraulic schematics 181 kB Download
Purewell VariHeat scheme 2 sealed with system pump Purewell VariHeat scheme 2 sealed with system pump Hydraulic schematics 185 kB Download
Purewell VariHeat scheme 3 sealed with plate and open vented Purewell VariHeat scheme 3 sealed with plate and open vented Hydraulic schematics 156 kB Download
Purewell VariHeat scheme 4 sealed with plate and sealed Purewell VariHeat scheme 4 sealed with plate and sealed Hydraulic schematics 158 kB Download
Purewell VariHeat scheme 5 sealed pump per boiler Purewell VariHeat scheme 5 sealed pump per boiler Hydraulic schematics 182 kB Download
Purewell VariHeat scheme 6 single pipe header individual pump Purewell VariHeat scheme 6 single pipe header individual pump Hydraulic schematics 185 kB Download
Purewell VariHeat scheme 7 sealed Purewell VariHeat scheme 7 sealed Hydraulic schematics 180 kB Download
Purewell VariHeat scheme 8 Sealed single pipe Independant Purewell VariHeat scheme 8 Sealed single pipe Independant Hydraulic schematics 202 kB Download
Purewell VariHeat C boiler PV70 CAD Purewell VariHeat C boiler PV70 CAD CAD 219 kB Download
Purewell VariHeat C boiler PV95 CAD Purewell VariHeat C boiler PV95 CAD CAD 219 kB Download
Purewell VariHeat C boiler PV110 CAD Purewell VariHeat C boiler PV110 CAD CAD 214 kB Download
Purewell VariHeat C boiler PV140 CAD Purewell VariHeat C boiler PV140 CAD CAD 219 kB Download
Purewell VariHeat C boiler PV180 CAD Purewell VariHeat C boiler PV180 CAD CAD 219 kB Download
Purewell VariHeat C wiring diagram Purewell VariHeat C wiring diagram Wiring diagrams 726 kB Download

  • Easy fit replacement for heating system refurbishment projects.

  • Small and medium sized commercial and public buildings including schools, care homes, hotels, churches and retail units.
  • Locations with substantial and continuous heating load including hospitals, care homes and hotels.

  • Ideal replacement for atmospheric boilers.


  • Reverse return pipework header kit condensing boiler
    • 2 Boiler Installation
    • 3 Boiler Installation
    • 4 Boiler Installation
  • Flues available through our flue partner Midtherm Engineering

  • Single boiler controls
    • Programmable Room Sensor
    • External air sensor
    • DHW cylinder sensor kit
    • 2nd heating circuit clip-in relay kit
    • Insertion water temperature sensor
    • Strap on water temperature sensor
    • External air sensor – Hard wired
    • Programmable room sensor- Hard wired

  • Multiple boiler controls
    • Programmable Room Sensor
    • External air sensor
    • DHW cylinder sensor kit
    • LPB Bus communications module
    • Insertion water temperature sensor
    • Strap on water temperature sensor
    • External air sensor – Hard wired
    • Programmable room sensor- Hard wired
    • Offset adjustable room sensor – Hard wired
    • Programmable room sensor – wireless
    • External air sensor – wireless
    • Radio module and radio repeater
    • Merley Sequence Controller