Not all boilers are the same - just take a look at what the Ravenheat CS80 has to offer

25kW to domestic hot water (DWH) output with a flow rate of 10.2 litres through 35o rise

  • 2 Year Guarantee*
  • SEDBUK A Rate
  • Compact in Size – 700mm High, 400mm Wide and 300mm Deep
  • Innovative Low Energy Consumption
  • Exceptionally Quiet in Operation
  • Large Digital Visible Temperature Adjustment
  • User Friendly Touch Controls, Simple and Easy to Use
  • Integral Valve Kit Eliminates Unsightly Valves Outside the Boiler
  • Built-in Deep Seal Condensation Trap Designed to Reduce Nuisance Freezing in Winter
  • Flexible Condensation Pipe Conveniently Located After the Trap
  • Manual and Automatic Air Vent Allows Air Out of the System More Easily When Commissioning
  • Brass and Premium Branded Components for Lasting Quality
  • The High Density Foam Lining of the CS80 Keeps Heat In and Allows for Quiet Operation
  • Removable Side Panels
  • Built-in Automatic By-pass
  • Low NOx Class 5 Meets New Stringent Building Codes
  • Solar Compatible
  • Minimum Low Power of 3.6kW Further Reduces Energy Cost
  • Greater Energy Saving Through the Appliance Modulating
  • Lightweight Design to Aid Installation
CS80 Boiler

Flue Options

CS80 Inside View

The new CS80 can be fitted with either a 100mm standard (concentric), a 125mm flue duct or a twin (eccentric) flue duct, which can be installed either vertical or horizontal, depending on the customer’s requirement.

A one metre standard horizontal flue kit is supplied separately; this can extend to 8 metres if required, or 13 metres vertical (maximum without bends). The above flue arrangements should fit most requirements however, alternative systems (Twin or 125mm) are available.

See installation manual for all flue options.

PartDescription Flue 60/100Part No
11 metre horizontal flue kitPR5023016
2Straight flue header/Sample PointPR5094110A
31 metre high plume kitTER110101
41 metre flue extensionPRFE
545o in line flue bendPR45FBI
690o in line flue bendPR90FBI
7Flashing sleeve/plateTEG060050
81 metre vertical terminalTER110200
9Combi ridge terminal kitTER090100
1090o flue exhaust deflection bendCUR110100
1145o flue exhaust deflection bendCUR110050
Flue Diagram

Alternative systems (twin or 125mm) are available for longer flue distance.

Easily Installed Neat Connections

Neat Connections


Built to exacting ISO 9001 standards using quality components, all our boilers carry the European CE mark. Each Ravenheat appliance undergoes rigorous testing and operating procedure before being carefully packed for maximum protection, ready to leave our factory.

We only use high quality components from leading industry manufacturers: Honeywell, Grundfos and Giannoni.

*Image for demonstration purposes only.

Boiler Specification

Central Heating Max Output
(Adjustable Modulation)
kW3.6 – 21.4
Domestic Hot Water Max Output
(Adjustable Modulation)
kW3.6 – 25.4
Domestic Hot Water
Flow Rate Raised 30oC△tI/Min11.9
Inlet Temperature 35oC△tI/Min10.2
Expansion Vessel18L
Maximum Central Heating TemperatureoC80
Installation Clearance
Belowmm80 - 150
Heating Flow & Return Compressionmm22
Gas Connectionmm15
Domestic Supply (Cold) Compressionmm15
Domestic Supply (Hot) Coppermm15
Condensing Pipe ¾ Push Fit Overflow Pipe
Flue Sizemm100
Electrical Mains Supply230v 50Hz
Fused 3amp
Nat Gas Band A 2005/2009% 90.3/88.9
Nox Class (lowest possible level)
Available with or without timer
Boiler Dimensions


Boiler must be correctly installed. Boiler must be commissioned by a Gas Safe registered engineer. Boiler must be registered with Ravenheat upon purchase (so 2 year warranty can be activated). Boiler must be correctly maintained and serviced by a qualified, competent person. For any other information please refer to the user guide and installation instructions. For more information on warranties please view our Warranty Terms & Conditions.

Technical After-Sales Service

Ravenheat have a technical helpline at its central headquarters in Leeds. Service engineers or their customers have the satisfaction of knowing they will receive advice, and the knowledge that one of Ravenheat’s own technicians is on hand should an on-site visit be required. Ravenheat only use their own highly qualified technicians thereby ensuring the highest quality and most reliable customer care.

Ravenheat run their own unique comprehensive installer training programme working alongside the regulative bodies and trade associations. The training programme is open to any Gas Safe Registered installer. For further information visit our training days page or emailing us at [email protected].