Masonry cookstove
Helmi, masonry cookstove kit
Helmi is an 850 kg Tiileri masonry cookstove, delivered as a kit, in a render or brick finish. It accepts the AirBox; the kit is available from €4,426.08 incl. VAT.
A masonry cookstove combines a cooking surface with a mass that stores the heat of the fire and then releases it into the room.
850 kg
catalogue weight
8.2 kW
nominal output
77%
efficiency (DoP)
2 to 3 days
installation time (indicative)
Genuine Finnish masonry heaters since 1952
Tiileri, tradition and quality, exclusively from Cœur de Foyer.
Complete kit, with its assembly plans
From 450 to 2,240 kg of heat-storing mass
Gentle, lasting warmth: up to 53.7 h of heat release
Efficiency up to 91% (declaration of performance)
Made in Finland
Heat-storing stoves, standard EN 15250
Tiileri bricks and stoves since 1952
Specifications
Catalogue weight
850 kg
Product reference sheet, 09/09/2026
Dimensions
980 × 680 × 920 mm
Product reference sheet, 09/09/2026
Cooking equipment (hob, oven)
Hob (689 × 695 mm frame) and oven
Product reference sheet, 09/09/2026
Nominal output
8.2 kW
Product reference sheet, 09/09/2026
Stored energy
21.7 kWh
Product reference sheet, 09/09/2026 — DoP
Heat release time (until output falls to 25% of peak output)
17.3 h
Product reference sheet, 09/09/2026 — DoP
Efficiency
77%
Product reference sheet, 09/09/2026 — DoP
Seasonal energy efficiency (ηs)
67%
Product reference sheet, 09/09/2026 — DoP
CO emissions
0.11% (1,375 mg/Nm³)
Product reference sheet, 09/09/2026 — DoP
Particulate matter / organic gaseous compounds / nitrogen oxides
40 / 91 / 154 mg/Nm³ at 13% O₂
Product reference sheet, 09/09/2026 — DoP
Flue gas temperature
[TO BE CONFIRMED]
Sources disagree
Log length
33 cm
Product reference sheet, 09/09/2026
Flue outlet
Bottom, included; connection side to be specified when ordering. Top outlet with the top connection kit (1 m of hollow-brick flue, cleaning door, connector)
Product reference sheet, 09/09/2026
Required flue class
[TO BE CONFIRMED]
Sources disagree
Safety distances to combustible materials
Below the cooking surface: 50 mm at the back and sides. Above the cooking surface: 500 mm at the sides and 1,000 mm upwards
Product reference sheet, 09/09/2026 — DoP
AirBox
Available
Product reference sheet, settled on 09/09/2026
Standard
EN 15250:2007
Product reference sheet
Indicative installation time
2 to 3 days
Factory workbook (October 2025) and records of 15/09/2026: range, indicative, not a guarantee
Warranty
5 years on Tiileri parts (materials, workmanship, operation); 2 years on doors, glass and metal parts
Manufacturer, warranty text of June 2026 — Warranty and after-sales
Standard EN 15250:2007 covers domestic heating appliances fired by solid fuel with slow heat release, that is heat-storing stoves. The declaration of performance (DoP) is the document in which the manufacturer declares the performance of the appliance measured under this standard.
AirBox. The AirBox ducts combustion air straight to the firebox. It is available on the Helmi, contrary to what the factory catalogue of January 2024 and the old printed Helmi brochure say. Listed price: €403.20 incl. VAT, AirBox page on coeurdefoyer.fr (in French).
How many hours of fire for your home?
Find your heated floor area and your home’s insulation: the chart gives the hours of fire per day in severe cold.
Indicative figures for severe cold. The thermal study of your project takes precedence.
Versions
Prices as listed on coeurdefoyer.fr on 16/09/2026.
Before you order
The supporting floor
850 kg rests on a small footprint. The load-bearing capacity of the floor or slab is checked for each project; we do not publish a general specification.
The flue
Have the connection to your flue, existing or new, approved before ordering.
Installation
Allow 2 to 3 days of installation as a guide. You can have the Helmi installed by a lead installer or build it yourself.
Key points
- 850 kg masonry cookstove, 980 × 680 × 920 mm, 8.2 kW, render or brick finish.
- 21.7 kWh stored and 17.3 h of heat release according to the declaration of performance.
- AirBox available.
- 2 to 3 days of installation as a guide.
Sources and verification
- Weight, standard, AirBox: Tiileri France product reference sheet (09/09/2026), as used in the brief of 15/09/2026.
- Dimensions, cooking equipment, output, log length, flue outlet: Tiileri France product reference sheet (09/09/2026), factory price list cross-checked with the Finnish catalogue of 01/01/2024 and the assembly plans.
- Stored energy, heat release, efficiency, ηs, emissions, safety distances: declaration of performance, as used in the product reference sheet of 09/09/2026.
- Prices and versions: coeurdefoyer.fr, recorded on 15/09/2026, category re-checked on 16/09/2026.
- Installation times: ranges from the factory workbook ‘Données catalogue France’ (October 2025) and the scoping records of 15/09/2026, upper value included; aligned across all pages on 25/09/2026 (Guiom’s decision).
- Page checked on 16/09/2026; translated on 25/09/2026.