The Common Confusion
Because both standards begin “domestic/appliances burning gas” and both deal with combustion, manufacturers new to CE certification sometimes assume EN 26 is the “oven” part of EN 30. It is not. EN 26 is a water-heater standard; gas ovens and grills are handled inside the EN 30 family (forced-convection ovens and grills appear in EN 30-1-2). Applying the wrong standard sends a type-application to the wrong technical file and delays certification.
What Each Standard Covers
| Aspect | EN 26 | EN 30 |
|---|---|---|
| Product | Gas-fired instantaneous (tankless) water heaters for sanitary hot water | Domestic gas cooking appliances: cookers, hobs, ovens, grills |
| Purpose of appliance | Heat potable water on demand | Cook food in pots or in an oven cavity |
| Typical type designations | Flue/installation types such as A, B11, B11BS, B12, B13 (draught-diverter/flue variants) | Freestanding, table-top and built-in hobs/cookers; gas categories per EN 437 |
| Scope of document | Construction, safety, rational use of energy, fitness for purpose, classification, marking | Safety (Part 1 series) and rational use of energy (Part 2 series) |
| Companion documents | EN 437 (test gases/pressures), Gas Appliances Regulation | EN 437, EN 30-1-2/1-3/1-4 variants, EN 30-2-1 efficiency, Gas Appliances Regulation |
How to Identify Which One Applies
- What is the appliance’s output? Heated water delivered to a tap or shower → EN 26. Heat applied to cookware or food in a cavity → EN 30.
- Does it have an oven cavity or grill compartment? Those are cooking functions and stay within EN 30 (forced-convection ovens/grills in EN 30-1-2), not EN 26.
- Check the flue/installation type: EN 26 classifies water heaters by their flue and air-supply arrangement (the A/B type designations); cookers are classified by gas category.
- Read the scope clause of the current edition against your exact model before building the technical file.
If you make a combi appliance that provides both hot water and heating, it is generally a boiler product handled by the boiler standards (e.g. the EN 15502 family), not by EN 26 or EN 30. Confirm the route with your test laboratory.
Reading EN 26 Installation Types (A, B and C)
Gas appliances are grouped by the way they draw combustion air and discharge combustion products. Understanding this grouping explains why EN 26 lists designations such as B11, B11BS, B12 and B13 while a cooker standard does not:
| Base type | Air and flue arrangement | Practical meaning |
|---|---|---|
| Type A | Flueless — draws room air and discharges products into the room | Strict room ventilation and size limits apply |
| Type B | Open flue — draws room air and discharges products through a flue | Correct flue and draught performance are tested |
| Type C | Room-sealed — air intake and flue discharge both ducted outside, sealed from the room | Appliance is independent of room air |
In EN 26 a designation combines the base type with numbers and letters describing the draught arrangement and fitted safety devices — for example a draught diverter and a specific flame-supervision arrangement. The exact meaning of each suffix is defined in the standard’s classification and definitions clauses, so the designation on your rating plate must match the configuration actually tested. Because test pressures, combustion sampling points and installation instructions differ by type, selecting the correct installation type before building the bench avoids repeating the combustion and flue tests. It also keeps the technical file and the rating plate fully consistent.
How the Tests Differ
| Test area | EN 26 water heater | EN 30 cooker |
|---|---|---|
| Gas tightness | Leakage of water-heater gas circuit and connections | Leakage of cooker gas circuit, taps and connections |
| Heat input | Rated input against gas category, with water flowing | Input per burner/hob against gas category |
| Combustion | CO in products across flue/installation types | CO, flame stability, sooting across pressures |
| Flame failure | Cut-off time on main burner and, where fitted, pilot | Cut-off time per burner |
| Hydraulic / functional | Water flow, temperature rise, hot-water delivery and stability | Not applicable (no potable-water circuit) |
| Cooking-specific | Not applicable | Surface temperature rises, pan supports, spillage, oven/grill performance |
| Efficiency | Rational use of energy for water heating | Hob/burner and oven efficiency (EN 30-2-1) |
The decisive difference is the working medium: EN 26 testing is built around controlled water flow and temperature rise (flow rate, outlet temperature, hot-water stability), while EN 30 testing is built around burners, cookware and oven cavities (flame behaviour, surface temperatures and cooking functions).
The Right Bench for Each Standard
| Product | Wanhe bench configuration | Key measurements |
|---|---|---|
| Tankless water heater (EN 26) | Water heater test bench with controlled water circuit (e.g. WH-RS line) | Flow 0–30 L/min, inlet/outlet temperature, 0.5% F.S., gas analysis, FFD |
| Cooker/hob (EN 30) | Gas cooker test bench / production test bench | Tightness, heat input, CO/CO₂, FFD timing, surface temperatures |
| Oven/grill (EN 30-1-2) | Cooker bench with oven temperature and forced-convection options | Cavity temperature, uniformity, grill performance, combustion |
Wanhe uses 0.5-class instruments, supports LPG and natural gas, and builds both laboratory benches for type testing and automated end-of-line stations for production, with serial-numbered reports for the technical file.
Mistakes to Avoid
- Citing EN 26 for an oven or grill — ovens belong to the EN 30 family;
- Citing EN 30 for a tankless water heater — water heaters need the hydraulic test routine of EN 26;
- Treating a combi boiler as a water heater — space-heating plus hot water puts it in the boiler standards;
- Testing without controlled water flow for EN 26 — a gas-only check cannot prove hot-water performance;
- Ignoring the correct flue/installation type when preparing an EN 26 type application.
Need the right bench for your product — water heater or cooker?
Send Wanhe your appliance type, gas categories and target market. We will specify the matching EN 26 or EN 30 test configuration and automation level, with a quotation within 24 hours.
Email: wanhe1718@gmail.com | WhatsApp: +86 18307609558 | Zhongshan, Guangdong, China
About WANHE TESTING — Zhongshan Wanhe Test Equipment Development Co., Ltd. is a factory-direct B2B manufacturer of custom gas-appliance-test-bench/" title="gas appliance test bench">gas appliance test benches, water heater and wall-hung boiler test rigs, environmental chambers, range hood testers and fatigue machines. CE / ISO 9001 / IEC / EN / GB / RoHS compliant, with custom design in 7–15 days and equipment delivered to manufacturers in 30+ countries.
Published: 2026-10 | Category: Gas Appliance Standards | Cluster E · Article 3