Compliance for Diesel Heaters: What ECE R122 and R10 Really Protect (and CE, RoHS, ETL, FCC, EAC, UKCA)

Every Sunster diesel air & water heater — across WiFi, 4G/LTE and Bluetooth Controller Units — ships with R122 + R10 + CE/CE-RED + RoHS covered for the exact SKU you buy, plus FCC / UKCA / EAC documentation by market. Most off-the-shelf diesel heaters on the market still piecemeal it: a CE sticker with no R122 component cert, or a WiFi panel with no RED/EMC file. Sunster doesn't make you stitch certificates together — one SKU, one complete compliance pack.

A diesel air or water parking heater is a combustion appliance plus an electronic control system. In a van, truck, RV or trailer it burns diesel, moves heat into the cabin, and runs a smart LCD, WiFi app or 4G module. Used at home, in a garage, cabin or workshop, it still burns diesel and still needs external exhaust, combustion-air separation and CO protection. One "CE label" on the box never proves road-use safety — so for vehicle and off-grid use the two marks to check first are ECE R122 and ECE R10, because they cover completely different risks.

What ECE R122 Protects: Combustion, Cabin Air, Temperature, Exhaust

UN ECE Regulation No. 122 covers heating systems for M (passenger), N (goods) and O (trailer) vehicles. It can be approved as a whole-vehicle heating system or as a heater component. For diesel parking heaters and water heaters the component route is what matters most, because the same heater may later be installed in different vans, trucks or RVs.

R122 is a safety regulation, not an EMC regulation. For a diesel/water smart heater it mainly protects three things:

1. Cabin Air Is Not Contaminated by Combustion Gases

For component approval, the heat-exchanger primary circuit is leakage-tested so combustion/polluted air cannot enter the heated air going to the passenger or load compartment. Accepted method: at 0.5 hPa gauge pressure, heat-exchanger leakage ≤30 dm³/h. For whole-vehicle checks, CO is sampled near the heated-air outlet and near the heating-air inlet; the outlet reading must not be more than 20 ppm CO above the inlet/outside reading, measured over a representative 10-minute period at maximum output.

Practical meaning: a cracked exchanger, failed gasket, wrongly routed recirculation duct or exhaust leak-back should not push CO or combustion products into the driving or sleeping area. Sunster sealed-combustion units keep combustion exhaust separate from cabin air, but R122 documentation is what proves the component was tested that way for the exact SKU. [5](@ref)

2. Touchable Surfaces Do Not Scald

Annex 5 temperature rules, maximum-output, still air ≤2 m/s, windows closed, 1-hour run:

• Driver-touchable bare metal ≤70°C; other materials ≤80°C.
• M1/N passenger-touchable parts, except outlet grille: ≤110°C; higher only with the manufacturer's documented safety concept proving no greater burn risk.
• Parts behind the driver's seat / defined overheating cases: ≤110°C where the approval specifies it.
• M2/M3 buses passenger-touchable parts: bare metal ≤70°C, other materials ≤80°C.
• Heated air at the outlet centre: ≤150°C.

Practical meaning: LCD bezel, air duct, water hose jacket, outlet grille and nearby trim must be engineered so normal contact does not burn. For home/garage use, the same surface limits matter wherever people can touch the unit or ductwork.

3. Combustion Emissions and Unsafe Operation Are Controlled

For liquid-fuel heaters, Annex 6 sets dry, undiluted exhaust limits at maximum output for 1 hour, still air ≤2 m/s, ambient 20±10°C: CO ≤0.1% vol., NOx ≤200 ppm, HC ≤100 ppm. Component and installation rules also cover flame-failure shutoff, overheat protection, fuel-pump cut, emergency control, marking, installation instructions and warning information; Annex 7 covers installation/manual/label duties for combustion heaters.

Practical meaning: the heater must shut down safely on ignition failure or airflow loss, not keep pumping diesel or smouldering inside the vehicle or building.

Water heaters: a liquid-fuel combustion heater mounted outside the passenger compartment and using water as the transfer medium may be treated as meeting the air-quality and surface-temperature annexes, while exhaust/emission and component safety/installation requirements still apply. Always ask for the certificate that names your exact air/water SKU, voltage and heat-exchanger version. [12](@ref)

What ECE R10 Protects: EMC for the Controller, WiFi, 4G and Pump

UN ECE Regulation No. 10 is the automotive electromagnetic compatibility regulation. It applies to vehicles and to electrical/electronic sub-assemblies/components and separate technical units fitted to vehicles — including L, M, N, O and other categories depending on the component and installation. [9](@ref)

For a smart diesel heater, R10 covers the whole electronic chain: mainboard, LCD switch, WiFi module, 4G/LTE modem, Bluetooth if present, fuel-pump driver, fan controller and any CAN/RS485 interface.

Emission — The Heater Must Not Radiate RF Noise

Component R10/automotive EMC typically uses CISPR 25 methods for onboard-receiver protection: broadband and narrowband radiated emission, shielded-room measurements, and conducted emission on power/signal lines. Component radiated scopes commonly cover 30–1000 MHz, conducted 0.15–30 MHz, with narrower/board-level checks added by the test plan; final limits depend on the R10 series, Annex and contracted CISPR 25 class. [3](@ref)

Practical meaning: the smart panel should not jam the van radio, DAB, GPS, truck telematics, TPMS or neighbouring cameras.

Immunity — The Heater Must Keep Working Under EM Stress

Component R10 programmes commonly include radiated immunity (ISO 11452 family, antenna/stripline/BCI), BCI 20–400 MHz, transient conducted immunity aligned with ISO 7637/vehicle-power standards, and ESD handled as a customer/design requirement — contact and air discharge values are often specified separately even though R10 type approval does not mandate ESD testing. [3,13](@ref) Radiated immunity is often taken to 2 GHz under older R10 series and extended toward 6 GHz under newer R10.07 profiles for radio/cellular bands. [6,19](@ref)

Practical meaning: alternator transients, phone towers, walkie-talkies, cold-start voltage dip or static discharge should not make the heater reboot, misfire, stick on or refuse to stop.

If the heater has WiFi or 4G, R10 is the automotive EMC baseline. Radio authorization is a separate track: CE-RED for the EU, FCC for the US, UKCA radio for Great Britain, plus regional 4G band/carrier and country approvals. R10 handles vehicle EMC; radio approvals handle spectrum use.

R122 vs R10 — The Shortest Version

R122 = "it burns safely." R10 = "it talks and switches safely." A smart diesel heater with any electronic control usually needs both, and 12V/24V variants should confirm R10 transients and R122 electrical/installation scope for each supply.

Vehicle Use vs Home Use — Different Rules, Same Combustion Safety

On-road / RV / truck / trailer

• Check R122 component approval for the exact heater SKU; R10 ESA approval for the exact controller/LCD/WiFi/4G revision.
• 12V and 24V installations should both be covered, including voltage-sag start, alternator transients and vehicle radio coexistence.
• Exhaust outside the cab, combustion-air intake separate from cabin air, ducts/hoses clear, mounting surface load-rated and vibration-damped. [1](@ref)

Home / garage / cabin / workshop

• A diesel heater with an AC adapter (e.g. 110–240V) is still a combustion appliance: route exhaust to outdoor open air, never run in a sealed room or bedroom without external exhaust. [11](@ref)
• Use a CO alarm in the occupied space; test it regularly. Some Sunster smart kits ship a CO detector/remote — treat it as supplementary, not a substitute for correct exhaust routing. [5](@ref)
• Electrical safety for the AC adapter, sockets and wiring is separate from R122/R10; ask for the applicable AC-product safety documentation by country/use case.
• For fixed building installation, follow local combustion-appliance, ventilation and electrical codes; do not assume a "CE" sticker covers fixed-home approval.

CE, RoHS, ETL, FCC, EAC, UKCA — What Each One Actually Means

CE — Conformité Européenne

Manufacturer declaration of conformity with the applicable EU rules for the exact product configuration. A diesel heater with electronics may involve EMC, low-voltage/electrical safety and — if wireless — RED; compliance scope depends on voltage, intended use, AC/DC supply and RF modules. CE is not a vehicle type-approval and does not by itself prove R122 road-use approval. [11](@ref)

CE-RED — Radio Equipment for WiFi/4G/Bluetooth

If the switch or heater contains intentional radio, EU wireless compliance is handled under the Radio Equipment Directive, separate from general CE-EMC and separate from R10 vehicle EMC. Ask for the RED certificate/model number matching the WiFi or 4G variant.

RoHS — Restriction of Hazardous Substances

Restricts lead, mercury, cadmium and other substances in electronic assemblies. Relevant for mainboard, LCD, sensors, harness and switches. It is a chemical/restricted-substance rule, not a fire, CO or EMC rule.

ETL — Intertek

Third-party safety listing commonly requested in North American retail, RV OEM or fleet specs. It is not an EU E-mark and not proof of R122/R10. Ask for it only when the sales channel or insurer requires a US/Canada safety listing; for AC home use, confirm which electrical-safety standard the listing actually covers.

FCC — Federal Communications Commission

Required when the heater, switch or module contains intentional radio: WiFi, Bluetooth, 4G/5G, etc. WiFi/Bluetooth LCD switches need equipment authorization for the US; 4G modules need the radio-module grant plus band/country approvals. A non-radio LCD may still need EMC handling, but not FCC radio certification. [5](@ref)

EAC — Eurasian Conformity

Eurasian Conformity mark for the EAEU market (Russia, Kazakhstan, Belarus and related channels). It is technical-regulation conformity, not the same file as CE; pair it with model-specific R122/R10, safety and EMC documents.

UKCA — UK Conformity Assessed

UK conformance mark for applicable product rules. For vehicle electronic sub-assemblies, EMC/radio expectations may still apply; for road-use heaters, confirm whether UNECE E-marking or a UK-specific approval route is accepted in the installation scenario. Post-Brexit rules change, so write it conservatively in buyer docs.

Supplier Checklist Before You Publish or Purchase

1. R122 component certificate — exact air/water SKU, voltage, heat-exchanger version and certificate number; not just "brand is R122 certified."
2. R10 EMC certificate — same controller hardware/firmware, LCD, WiFi/4G variant, 12V/24V if both sold, R10 series/version and tested frequency/transient scope.
3. CE Declaration of Conformity — SKU, directives/regulations, AC/DC supply, controller version, wireless module; plus CE-RED separate if WiFi/4G/Bluetooth.
4. RoHS declaration by part number for board, switch, sensor and harness.
5. Wireless approvals — FCC ID for US WiFi/4G/Bluetooth; CE-RED for EU; UKCA radio for GB; regional 4G bands/carrier approvals by target country.
6. North America / AC home — ETL or other requested safety listing confirmed against the actual kit; for 110–240V home use, ask for the AC adapter/appliance electrical-safety standard, not just automotive EMC.
7. Installation manual — exhaust routing, combustion-air source, heat-shield distances, CO alarm advice, overheat/flame-failure behaviour, 12V/24V wiring and cool-down procedure.