Great Value Product

Biasi Advance 25C Gas Combi Boiler (790RK)

All Gas boilers and accessories must be installed by a Gas Safe Registered Engineer. Unfortunately this product cannot be delivered offshore. We cannot accept the return of unwanted boilers if the box/packaging has been opened (your statutory rights are not affected).

Efficient, robust and reliable combi boiler with stainless steel single coil heat exchanger, which is designed to be less susceptible to dirt and debris making it ideal for replacing an existing boiler. Includes a weather compensation function which allows the boiler to monitor and automatically react to changes in outside temperature (requires outside air temperature probe).

  • Max. Domestic Hot Water Output: 25kW
  • Max. Central Heating Output: 20kW
  • Stainless Steel Heat Exchanger
  • Top Flue Outlet
  • Compatible with Solar Panels
  • 5 Year Manufacturer’s Guarantee (Registration Required, T&Cs Apply)
  • 85,645BTU
  • LCD Display
  • Visible Pressure Gauge
More Info

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£559.99Inc Vat

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BTU85,645 BTU
Boiler Depth290 mm
Boiler Height700 mm
Boiler TypeCombi
Boiler Width400 mm
CALC - Fuel TypeGas
Compatible with Solar PanelsCompatible with Solar Panels
Display TypeLCD Display
Energy Rating (Heating)A
Energy Rating (Water)A
Filling Loop SuppliedFilling Loop Not Supplied
Fitting RequirementsMust be Fitted by a Qualified Installer
Fixing Jig SuppliedFixing Jig Supplied
Flow Rate (Ltr/Min)10.3 Ltr/min
Flue Connection Diameter100 mm
Flue Outlet PositionTop Flue Outlet
Flue SuppliedFlue Not Supplied
Frost ProtectionFrost Protection
Fuel TypeGas
LPG Conversion Kit SuppliedLPG Conversion Kit Available Separately
Manufacturer Guarantee5 Year Manufacturer’s Guarantee (Registration Required, T&Cs Apply)
Max. Heat Output CH (Pn)20 kW
Max. Heat Output DHW (Pn)25 kW
Model Name/NoAdvance 25C
Pack Size1
Parent ColourWhite
Pieces in Pack/Case1
Product Returns NoteWe cannot accept the return of unwanted boilers if the box/packaging has been opened (your statutory rights are not affected).
Product TypeBoiler
Range NameAdvance
SAP Seasonal Efficiency92 %
Sound Pressure Level52 dB
Supplier Manufacturer Helpline01922 714636
Temperature Range (Heating)25-80 °C
Temperature Range (Water)35-60 °C
Total Product Weight31 kg

Product Contents

Boiler, bracket and fittings.

Delivered direct from our suppliers in the number of working days stated on the delivery button

Direct from our supplier delivery restrictions

Geographic restrictions apply, check your postcode below to see if any apply to you. For some locations delivery may take longer than the specified delivery time, and we can not currently offer delivery to offshore addresses.

Please ensure we have your mobile phone number when you order so we can keep you updated with deliveries.


Please note - If you wish to return this item you will need to call us on our freephone number 03330 112 112 to arrange a free collection.


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