Cast iron condensing, fully modulating, pre-mix gas fired commercial boiler.

Available in 5 condensing models with outputs (@50/30°C) of 70, 95, 110, 140 and 180 kW.

 

Efficiency 96 product icon
Fuel NG product icon
Turndown 3 product icon
Warranty 10 heat exchanger product item
ErP Part L Compliant product icon
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  • 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
  • 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
  • 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
  • Suitable for use with LPG Air for installation in the Channel Islands
  • 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
  • The only cast iron condensing commercial boiler that is compliant with the Energy related Products Directive (ErP) available in the UK.
  Purewell VariHeat boiler models Units PV70c PV95c PV110c PV140c PV180c
Energy Building regulations - seasonal efficiency (%) gross 95.35 95.62 95.89 95.74 94.63
ErP efficiency rating (modules ≤ 70 kW only)   A N/A N/A N/A N/A
Boiler output 80/60°C kW 63.5 86.3 99.8 134.4 172.8
Boiler output 50/30°C kW 70 95 110 140 180
Boiler input (gross) Maximum kW 72.2 98.4 115 151.3 194.6
Boiler input (net) Maximum kW 65 88.6 103.5 136.3 175.2
Boiler output Minimum 80/60°C kW 21.2 28.8 33.3 44.8 57.6
Boiler output Minimum 50/30°C kW 20.3 27.6 31.9 40.6 52.2
Water Water content litres 8 8 8 1 1
System design flow rate @ 20°C ∆T rise l/s 0.8 1.1 1.3 1.7 2.1
Water side pressure loss @ 20°C ∆T rise mbar 32 52 72 134 221
System design flow rate @ 11°C ∆T rise l/s 1.5 2.1 2.4 3 3.9
Water side pressure loss @ 11°C ∆T rise mbar 96 176 244 442 731
Maximum water pressure barg 6 6 6 6 6
Gas Gas flow rate natural gas (G20) - maximum m3/hr 6.88 9.37 10.96 14.42 18.54
Nominal inlet pressure natural gas (G20) - maximum mbar 20 20 20 20 20
Maximum gas inlet pressure natural gas (G20) mbar 25 25 25 25 25
Flue Approx. flue gas volume @ 15°C, 9.3–9.8% CO2 @ N.T.P m3/hr 86.13 117.37 137.16 180.53 232.12
Approx. flue gas temperature @ 50/30°C °C 40 40 45 50 50
Approx. flue gas temperature @ 80/60°C °C 60 60 65 70 75
Pressure at boiler flue spigot @full load Pa 100 100 100 100 100
Dry NOx emission (0% excess oxygen, dry air free) European Class 5 mg/kWh 18.5 57.5 69.2 57 67.1
Connection Water flow/return connections inches R2” R2” R2” R2” R2”
Gas inlet connection pipe thread size inches R1” R1” R1” R1” R1”
Nominal flue diameter (I/D) mm 150 150 150 150 150
Electrics Electrical supply   230V 1Ph 50Hz
Power consumption @maximum boiler modulation W 94.3 94.3 94.3 207 207
Start current Amp 0.54 0.54 0.54 0.6 0.6
Run current Amp 0.41 0.41 0.41 0.9 0.9
Approx shipping weight kg 170 170 170 230 230
Noise emission @1 m and @maximum boiler modulation Max dB (A) 53 53 53 65 65
  Title Type Size  
Purewell VariHeat brochure Purewell VariHeat brochure Product brochures 6319 ko Download
Purewell VariHeat C dimensions Purewell VariHeat C dimensions Dimensions 839 ko Download
Purewell VariHeat C technical data table Purewell VariHeat C technical data table Data tables 547 ko Download
Purewell VariHeat C manifold kits installation manual Purewell VariHeat C manifold kits installation manual Installers guides 2546 ko Download
Purewell VariHeat condensing user instructions Purewell VariHeat condensing user instructions Installers guides 2474 ko Download
Purewell Variheat condensing installation manual Purewell Variheat condensing installation manual Installers guides 6705 ko Download
Purewell VariHeat scheme 1 open vented with low loss header Purewell VariHeat scheme 1 open vented with low loss header Hydraulic schematics 181 ko Download
Purewell VariHeat scheme 2 sealed with system pump Purewell VariHeat scheme 2 sealed with system pump Hydraulic schematics 185 ko Download
Purewell VariHeat scheme 3 sealed with plate and open vented Purewell VariHeat scheme 3 sealed with plate and open vented Hydraulic schematics 156 ko Download
Purewell VariHeat scheme 4 sealed with plate and sealed Purewell VariHeat scheme 4 sealed with plate and sealed Hydraulic schematics 158 ko Download
Purewell VariHeat scheme 5 sealed pump per boiler Purewell VariHeat scheme 5 sealed pump per boiler Hydraulic schematics 182 ko Download
Purewell VariHeat scheme 6 single pipe header individual pump Purewell VariHeat scheme 6 single pipe header individual pump Hydraulic schematics 185 ko Download
Purewell VariHeat scheme 7 sealed Purewell VariHeat scheme 7 sealed Hydraulic schematics 180 ko Download
Purewell VariHeat scheme 8 Sealed single pipe Independant Purewell VariHeat scheme 8 Sealed single pipe Independant Hydraulic schematics 202 ko Download
Purewell VariHeat C boiler PV110 CAD Purewell VariHeat C boiler PV110 CAD CAD 214 ko Download
Purewell VariHeat C boiler PV140 CAD Purewell VariHeat C boiler PV140 CAD CAD 219 ko Download
Purewell VariHeat C boiler PV180 CAD Purewell VariHeat C boiler PV180 CAD CAD 219 ko Download
Purewell VariHeat C boiler PV70 CAD Purewell VariHeat C boiler PV70 CAD CAD 219 ko Download
Purewell VariHeat C boiler PV95 CAD Purewell VariHeat C boiler PV95 CAD CAD 219 ko Download
Purewell VariHeat C wiring diagram Purewell VariHeat C wiring diagram Wiring diagrams 726 ko Download
Purewell VariHeat condensing seasonal efficiency sheet Purewell VariHeat condensing seasonal efficiency sheet Seasonal efficiency sheets 109 ko 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,years:2014-2017 778 ko Download
  • Easy fit replacement for refurbishment projects.
  • Medium sized commercial and public buildings including schools, care homes, hotels, churches and retail units.
  • Smaller commercial and public buildings including community 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 header kit available for:

  • 2 boiler installation
  • 3 boiler installation
  • 4 boiler installation ( 2 x 2 boiler installation kit)

Flues available through our flue partner Midtherm Engineering

Single boiler controls

  • 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

  • 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.