Four published figures, and a fifth that decides whether it may be fitted
A wood stove is a firebox, a flue spigot and a door, and almost every listing publishes the same four numbers about it: the rated output in kilowatts, the efficiency as a percentage, the heatable volume in cubic metres, and the flue diameter in millimetres. Three of those are comparable between makers. The fourth one — heatable volume — is not, and it is the figure buyers lean on hardest. It is derived from the rated output against an assumed building standard, and each maker assumes a different one: two 6 kW stoves in this shelf state 120 m³ and 180 m³ respectively, and the difference is an assumption about insulation rather than a difference in the stoves. The number that actually constrains a room is the rated output, and the rule of thumb the trade uses — roughly 1 kW per 10 m² in a reasonably insulated room — puts most of these stoves in the same bracket. Then the flue spigot: its diameter and whether it leaves the stove at the top or the back decides what pipe will connect it, and a rear spigot on a stove that must stand in a corner is a fitting problem no specification sheet describes. Finally the approval: the European standard for roomheaters and, in Germany, the emission stage the appliance meets — the thing that decides whether a stove may legally be connected at all. We compare nominal output, efficiency, required draught, flue spigot diameter, flue gas temperature, emissions, standard named, energy label, construction, dimensions and weight.
5.2 kW, glass door, anthracite
Three published lines — a glass door, an output and a colour. The least documented listing in this family, and the one that costs least.
Best for: A small room where the buyer already knows the flue and is not relying on the listing for it
7 kW, 76 %, firebox 390 × 378 × 267 mm, Ø 150 mm
Seven lines including a firebox measured in three dimensions and a log store below — and two area figures whose units do not agree with each other.
Best for: A room where the log store below is worth having and the firebox dimension decides the wood order
312 °C, 4.8 g/s, ≤ 40 mg/m³, steel, black
Three published figures, all of them flue gas figures: temperature, mass flow and particulates. No output, no efficiency, no dimensions.
Best for: A buyer who will get the full data sheet from the maker and wants the flue figures confirmed first
12.1 kW, oven 345 × 370 × 190 mm, Ø 130 mm, 3.9 kg/h
Ten published lines including a fuel moisture limit, an hourly wood consumption and an oven cavity — the only listing here to publish any of the three.
Best for: A larger room where the oven is part of the point and the flue has already been assessed
5.2 kW, smallest of its series, on legs
One published sentence: the smallest model in its series, fitted with legs. The output is in the title and nothing else is stated anywhere.
Best for: A small space where the flue is already established and the figures will come from the plate
9 kW, 77.8 %, Ø 130 mm top, 12 Pa
The most completely documented listing in this family: output, efficiency, flue diameter, required draught, flue gas temperature and emissions, all published.
Best for: A buyer who intends to have the flue calculation done properly and needs the appliance’s inputs
7 kW, natural stone, oval, up to 148 m³ as stated
An oval natural-stone stove whose listing repeats its own title as its specification. The volume figure in that title is the whole of what is published.
Best for: A room where the oval footprint solves a placement problem and the figures will come from the maker directly
9.51 kW, 78.02 %, 10.5 g/s · 250 °C · 12 Pa
The most complete emission set in this family — five figures plus the flue gas triple — on a stove with a baking compartment and a hotplate.
Best for: A kitchen or living room where the oven earns its place and the flue figures need to be complete
7 kW, soapstone, self-closing door, multiple connection approved
The only appliance here approved for multiple connection and for coal, with an automatic air regulation for continuous burning and optional storage stones.
Best for: An installation where a shared flue is already the situation and the maker’s approval is what is needed
Only the specifications at least four models out of five state. A column that is more empty than full compares nothing.
| Model | Price | Amazon reference | Construction | Dimensions | Efficiency |
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Specifications: manufacturer sheets and Amazon product pages. Prices and availability: Keepa. No product on this site has been physically tested.
Most recent revision in this category: September 22, 2026.
