Not all boilers are the same - just take a look at what the Ravenheat HE98S has to offer

31kW to domestic hot water (DHW) output with DHW flow rate of 12 litres a minute through
a 35oC rise

Customer Benefits

  • SEDBUK A Rate
  • 5 Year Warranty*
  • OpenTherm Compatible
  • Weather Compensation (optional)
  • DHW flow rate of 12 l/min @ 35 degree rise
  • Compact Size – H-700mm, W-400mm, D-300mm
  • Fully ErP compliant
  • Backlit LCD
  • Whisper Quiet in Operation
  • Built in frost protection
  • Integral colour coded valve kit eliminates unsightly valves below the boiler
  • User friendly controls, simple and easy to use
  • High density insulation
  • DHW pre-heat function
  • Minimum low power of only 3.7kW further reduces energy cost
HE80 Boiler

Installer Benefits

  • Brass and Premium Branded Components for Lasting Quality
  • Stainless Steel main heat exchanger
  • Fully accessible from the front making service easier
  • Side clearance of only 1mm required
  • Easy release control panel allows easy access for servicing
  • Built-in deep condensate trap designed to reduce external nuisance freezing in winter
  • Multi fix wall hanging bracket available (optional)
  • Flexible condensation pipe for multi positioning discharge drain
  • Lightweight design to aid installation
  • Removable side panels
  • Built in automatic by-pass
  • Low Nox class 6 – 36.06 mg/kWh
  • Anti-locking pump and valve feature
  • Stand-off bracket available for piping down the back of the appliance (optional)

Simple yet innovative, the control display on the HE98S slides up with ease to allow easy access when servicing.

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

Clear View Display Screen

The HE98S combination boiler has a high resolution backlit LCD screen, featuring customer friendly buttons for optimum operation, making it easy to use in poor light conditions. This feature enables the user to easily set the heating and hot water temperatures, central heating times and view the system pressure.

HE80 Display Screen

Single coil stainless steel heat exchanger

Stainless Steel Heat Exchanger

The stainless steel single coil heat exchanger will ensure constant water speeds over a long lifecycle, coupled with this being able to access the heat exchanger from the front facilitates ease of service through the lifecycle of the boiler. The coil itself is designed to have wide water ways which lessens the likelihood of debris build up in the heat exchanger, the absence of manifolds lengthens the life expectancy of the heat exchanger by reducing the number of weld points and the number of seals.

Stainless Steel Heat Exchanger

(compatible room stat required)

OpenTherm boilers provide more precise control directly from the room thermostat to the boiler’s software which modulates the gas valve and central heating pump. This allows the precise gas input requirement to match the varying demand signal i.e. if the house needs to be one degree warmer the control tells the boiler it can start and run at a lower power. By reducing the flow temperature to a minimum of the heat required,the flow temperature is kept below the dew point (50°C),thus allowing the boiler to operate in condensing mode which is more efficient. Without OpenTherm even with the best controls the boiler will always run at full power consuming significantly more energy (both gas and electric) affecting the homeowner’s energy bill. Whereas with our HE98S by just applying the necessary heat there is a significant saving available and all of this is done automatically by the boiler and its controls.

Dimensions & Clearances

Dimensions & Clearances

Flue Options

HE98S Internal Diagram

The new HE98S 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 lengths and options.

Flue Items
PartDescription Flue 60/100Part No
11 metre horizontal flue kitTER160050
2Straight flue header/Sample PointCOL160050
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

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

Flue Diagram

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.

*Image for demonstration purposes only.

Boiler Specification

Central Heating Max/Min Output
(Adjustable Modulation)

3.7 - 26.2 kW
Domestic Hot Water
Max/Min Output

3.7 - 31 kW
Domestic Hot Water
Flow Rate Raised 30°CΔT
Inlet Temprature 35°CΔT

14.0 I/min
12.0 I/min
Expansion Vessel8L
Maximum Central Heating Temperature80oC
Installation Clearance

1 mm
125 mm
80 - 150 mm
Heating Flow & Return Compression Gas Connection
Domestic Supply (Cold) Compression
Domestic Supply (Hot) Compression
Condensing Push Fit Pipe

22 mm
15 mm
15 mm
Flue Connection100 mm
Electrical Mains Supply230V 50HZ
Fused 3amp
Nat Gas AB and A 2005/200990.3 / 88.9%
NOx Class6 (36.06mg/kWh)
OpenTherm CompatibleYes
Weather Compensator OptionYes
Noise level52 Db
Auxiliary Electricity Consumption
elmax at full load
elmin at part load
PSB in standby mode

0.034 kW
0.016 kW
0.005 kW
HE98S 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 5 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].

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