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Morsø S81-90

image of the Morsø S81-90

This stunning new multi-fuel Morsø S81-90 insert wood burning stove has been specifically designed with a UK standard fireplace opening in mind, making it an ideal choice when replacing an outdated gas fire or open grate.

The Morsø S81 is a compact steel stove with a quality cast iron door. This beautiful 4kW insert is perfect for smaller rooms, but has all the style you have come to expect from Morsø. With its three and four-sided trim options in dark grey or brushed steel this 88% net efficient stove will suit any home.

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QR Code for Morsø S81-90

If you would like to take these details with you to your nearest Morsø dealer, without having to print them out, you can scan this QR code with an app on your smart phone.


  • Air wash system
  • Pre-heated primary air
  • Pre-heated secondary air
  • Tertiary air supply
  • Ash can
  • Direct air supply

Important Note:
The S81-90 must be installed in conjunction with a 125mm internal diameter flue liner or chimney system. The use of larger liners or chimney systems may result in a reduced draft and poor performance of the stove.


  • Wood and briquettes
  • Approved manufactured smokeless fuel


  • Dark grey


  • Dark grey
  • Brushed stainless steel


  • EN 13240
  • Defra Approved


S81-90 Diagram

S81-90 CAD

Technical details

Rated output (kw)4
Log length (cm)28
Flue outlet, internal ø (mm)134
Minimum internal flue ø (mm)125
Weight (Kg)58
Efficiency Net / Gross (%)88/80.1
Height (Stove Body) (mm)495 - 555
Width (Stove Body) (mm)388
Depth (Stove Body) (mm) (Excluding Door)320
Trim Height (mm)567
Trim Width480

Clearances to combustibles

Top (mm)600
Sides (mm)225
Rear (mm)
Soft furniture (mm)700
Above the floor (mm)150*
*Combustible Floors

Where the stove is not installed in a traditional fireplace opening with a constructional hearth the following clearance apply.

If the stove is installed over combustible flooring, a 12mm thick non-combustible floor protection must cover the floor under the stove and extend at least 300mm in front and 150mm either side of the stove.

The minimum clearance from the non-combustible floor protection to the under side of the stove is 150mm

  • morsouk

    Hi John,

    The installation of any UK appliance must comply with the requirements of Buildings Regulations approved document J 2010 (ADJ) not with HETAS recommendations.

    ADJ permits the use of 125mm diameter flue systems with smoke except appliances that utilize a 125mm compatible flue collar.

    The Morsø S81-90 inset has a 125mm flue collar and is smoke except, and can therefore be installed on a 125mm flue.

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