Chinese diesel heaters have transformed the van conversion market in the UK. Five years ago, a heater for your campervan meant spending £800–£1,200 on a Webasto or Eberspacher unit plus installation. Today, a complete Chinese diesel heater kit costs £80–£180 and heats a van just as effectively. The question is whether the lower price comes with hidden costs in reliability, noise, and safety.
This guide covers everything you need to know to choose, install, and maintain a diesel heater for UK van life — whether you are on a strict budget or willing to spend more for peace of mind.
How Diesel Heaters Work
All diesel heaters work on the same principle. A small metering pump draws diesel from your vehicle's tank (or a separate container) and delivers it in measured pulses to a combustion chamber. A glow plug ignites the fuel, and a fan blows air over a heat exchanger to produce hot air. Exhaust gases are vented outside through a dedicated pipe.
The heater draws 12V power for the fan, control board, and glow plug. During startup, the glow plug draws about 8–10 amps for 2–5 minutes. Once running, the fan draws 0.5–3 amps depending on the speed setting.
The system is simple, proven technology. An Eberspacher Airtronic D2 and a £120 Chinese heater from Amazon run on the exact same engineering principles. The differences are in build quality, materials, and quality control.
Chinese vs Premium: The Real Differences
Chinese Heaters (£80–£180)
The most common Chinese brands available in the UK include Autoterm, Vevor, Hcal, Maxpeedingrods, and HappyBuy. Many of these are unbranded units from the same factories in Zhejiang province. The components are generally identical across brands — the same pump, the same glow plug, the same control board, with different stickers and packaging.
Common characteristics:
- 2kW or 5kW output options. The 2kW unit is sufficient for a standard LWB van (Ford Transit, Mercedes Sprinter).
- Digital LCD controller with temperature setting and altitude compensation.
- Complete kit including heater unit, combustion intake pipe, exhaust pipe, fuel pump, mounting bracket, and wiring loom.
- Supplied with a generic stainless steel exhaust silencer (undersized for UK use — more on this later).
- CE marked but not UKCA or TUV certified.
- One-year warranty from the seller (often not honoured).
The price spread within Chinese heaters reflects the quality of the control board and the fit of the combustion chamber components. A £180 Autoterm is noticeably better assembled than an £80 unbranded unit — the welds are cleaner, the gaskets fit properly, and the control board has temperature sensors that actually work.
Premium Heaters (£800–£1,400 installed)
- Eberspacher Airtronic D2 or D4 — the industry standard for over 40 years.
- Webasto Air Top 2000 STC — comparable quality, slightly quieter fan.
- Both are TUV, CE, and UKCA certified. They meet marine and RV standards.
- Fully serviceable with readily available spare parts at any UK diesel heater specialist.
- Genuine Eberspacher dealers in every major UK city (Southdowns, O'Leary Motorhomes, CAK Tanks).
- Two-year warranty, supported by the manufacturer in Germany.
The premium is in the details. The heat exchanger in an Eberspacher is made from higher-grade stainless steel and is laser-welded in a jig, meaning it maintains consistent wall thickness and will not crack after repeated thermal cycling. The fan motor is a continuously rated brushed unit rated for 10,000+ hours. The glow plug is rated for 5,000 starts. The control board includes over-voltage protection, over-temperature cutoff, and a diagnostic system that outputs fault codes.
A Chinese heater uses cheaper materials. The heat exchanger is often stamped from thinner steel and MIG-welded by hand, leading to inconsistent thickness and potential cracking after 500–1,000 hours. The fan motor is a generic DC motor rated for 2,000–3,000 hours. The glow plug is a generic ceramic type that may fail within 100 starts. The control board has basic over-temperature protection but no fault diagnostics.
Does the Quality Gap Matter?
For a weekend campervan used 15–20 nights a year, an £80 Chinese heater is a completely sensible choice. It will keep you warm, installs in an afternoon, and even if it fails after three years, you have saved hundreds compared to a premium install.
For full-time van life — living in your van through a Scottish winter, relying on the heater to run every night from October to March — the premium is worth it. The Eberspacher will start every time for a decade. The Chinese heater may need a glow plug replacement at 18 months, a new control board at 3 years, and a full replacement at 5 years.
Our experience across six vans (three with Chinese heaters, three with Eberspachers) matches this pattern. The Chinese heaters work brilliantly for 12–18 months, then require periodic maintenance. The Eberspachers run without issues for the entire ownership period.
Sizing: 2kW vs 5kW
This is the most common mistake in van heater installations. UK van lifers consistently buy heaters that are too large.
A 2kW heater is correct for:
- Ford Transit Custom (LWB or SWB)
- Mercedes Sprinter (MWB or LWB)
- VW Crafter or Transporter
- Peugeot Boxer / Citroen Relay (up to LWB)
- Any well-insulated panel van or camper conversion
A 5kW heater is only needed for:
- Horseboxes or large coach-built motorhomes
- Vans with very poor insulation (no roof lining, single-glazed windows)
- Rapid heating of a freezing van before bed on a timer
The problem with oversizing is short-cycling. A 5kW heater running at minimum output in a standard van produces more heat than needed, so it reaches the set temperature quickly and switches off. After cooling down, it fires up again. This cycle repeats every 5–10 minutes, which is harder on the heater components (especially the glow plug) and produces a pulsing on-off heat rather than a steady warmth.
A properly sized 2kW heater runs continuously on low output, maintaining a steady temperature. The components experience less thermal stress, the fuel consumption is lower, and the van stays consistently warm.
Installation Guide for Self-Installers
If you are installing a Chinese diesel heater yourself — and many people do — here are the critical things to get right.
Mounting the Heater
The heater unit must be mounted horizontally, with the combustion chamber below the fan housing. It can be installed inside the van under a seat or in a cupboard, but it needs a supply of air from inside the living space (not from a sealed compartment). A common mistake is to install the heater in a sealed under-seat compartment with no air gap, causing the heater to recirculate its own exhaust in extreme cases.
Mount the heater on a rubber isolation pad to reduce vibration noise through the van body. The heater unit itself produces a low hum that amplifies through metal panels.
Fuel Pickup
The most reliable method is a dedicated fuel tap fitted into the top of your diesel tank. This requires drilling a hole in the tank flange or removing the fuel sender unit and fitting a purpose-made pick-up pipe. Kits are available from CAK Tanks and Van Comfort for about £25.
If you are not comfortable drilling the tank, a T-piece into the existing fuel line works but carries a small risk of air ingress. Do not use a fusible tap (clamp-on type that punctures the fuel line) — these are unreliable and can leak over time.
The fuel pump must be mounted outside the van, underneath the vehicle, as close to the tank as possible. The pump makes a ticking noise that is audible inside the van if the pump is mounted on the chassis rail directly below the driver's seat. Mount it on a rubber bush or pad to decouple the sound.
Route the fuel line with a gentle upward gradient from pump to heater with no loops or kinks where air bubbles could collect.
Exhaust
The exhaust pipe must vent outside the van, routed so that no exhaust gases can re-enter through vents or windows. Extend the exhaust at least 30cm beyond the van body. The exhaust tip should point downward to prevent rain ingress, and should not be positioned near the fresh air intake of your diesel heater or any cab air intake.
The standard exhaust silencer supplied with Chinese kits is usually only 25cm long and does not reduce noise much. A longer aftermarket silencer (available from Van Comfort or eBay for £15–£25) makes a significant difference to noise levels.
Combustion Intake
The combustion air intake can be drawn from inside the van (which can marginally reduce available oxygen) or from outside via a dedicated pipe. Drawing from outside is better for air quality inside the van, but introduces a potential route for exhaust gas contamination if not properly separated from the exhaust outlet.
We route the combustion intake from inside the van floor, with a mesh filter to prevent debris ingress. In a well-sealed van (most are not as airtight as you think), this is fine for short-term use. If you run the heater all night every night, route the intake externally.
Air Intake (the hot side)
The hot air outlet should be positioned to circulate freely around the van, not blocked by a seat or cupboard. A flexible 75mm duct can be routed to a specific area (the sleeping area or the living area), but the heater fan works best with minimal back pressure, so keep duct runs under 1 metre.
Do not put the heater intake close to the floor. Cold air sinks, so the heater intake at floor level will draw the coldest air, making the thermostat run longer and use more fuel. Mount the intake 20–30cm above the floor.
Power Consumption and Battery Management
A diesel heater draws power from your leisure battery. Understanding the numbers is essential for off-grid use.
- Startup (glow plug heating): 8–10A for 2–5 minutes
- Running (fan only): 0.5A (low setting) to 3A (high setting) on a 2kW unit
- 5kW unit running fan: 1A (low) to 5A (high)
- Typical 8-hour overnight run on low: 8–12Ah total consumption from your leisure battery
If you run a 100Ah lead-acid leisure battery (usable capacity approximately 50Ah), an overnight heater run uses 8–12Ah. Add LED lights, phone charging, a 12V fridge (20–35Ah per day), and a water pump, and you are at 40–55Ah per day — right at the limit of what a 100Ah battery can supply without solar top-up.
With a 100Ah lithium battery (usable capacity 80–90Ah), the same load is fine. With solar input, you can run the heater indefinitely in UK winter conditions provided your solar panels are producing at least 50–100W of average daily output.
Many Chinese heater controllers include a voltage cutoff setting. Set this to 11.8V for lithium batteries or 12.0V for lead-acid to prevent draining your battery below safe levels.
The Altitude Problem
Chinese diesel heaters are notorious for failing at altitude. The issue is the control board's altitude compensation. Most Chinese heaters use a simple barometric sensor on the board, which adjusts the fuel-air mix. In practice, this sensor is often inaccurate or absent, causing the heater to produce excessive smoke at altitudes above 500m, then fail to ignite above 1000m.
This is a genuine issue for UK van lifers who spend time in the Scottish Highlands, the Lake District, Snowdonia, or the Peak District. Many of the best wild camping spots sit at 300–800m.
Solutions:
- Eberspacher and Webasto heaters have genuine altitude compensation that works reliably up to 4,000m.
- Some higher-end Chinese heaters (Autoterm, Planar) have decent altitude compensation sensors.
- With budget Chinese heaters, you can disable altitude compensation on some controllers (check settings menu for an ALT or HIGH option) or install a manual bypass switch.
If you plan to camp regularly in the Highlands or Snowdonia, this is the one argument for buying a more expensive heater.
Noise Comparison
Diesel heater noise is driven by three sources: the combustion fan, the air circulation fan, and the fuel pump ticking.
| Heater Type | Interior Noise (low setting) | Interior Noise (high setting) | Fuel Pump Tick |
|---|---|---|---|
| Eberspacher D2 | 32–35 dB | 42–45 dB | Barely audible inside |
| Webasto Air Top 2000 | 30–33 dB | 40–43 dB | Barely audible inside |
| Chinese 2kW (generic) | 38–42 dB | 48–52 dB | Audible, especially if pump is chassis-mounted |
| Chinese 2kW (Autoterm) | 35–38 dB | 44–48 dB | Moderate |
For reference, 35 dB is a quiet library. 50 dB is light rainfall. The Chinese heater is noticeably louder, but not objectionably so for most people. The fuel pump tick is the more common annoyance. Mounting the pump on a rubber bush solves this effectively.
Maintenance Schedule
| Interval | Task |
|---|---|
| Every 500 hours (or annually) | Remove and clean glow plug. Check for carbon build-up. Replace if ceramic tip shows cracks. |
| Every 1,000 hours | Remove combustion chamber, clean carbon deposits from heat exchanger fins. Replace combustion chamber gasket. |
| Every 2,000 hours | Replace glow plug (Chinese) or every 5,000 hours (Eberspacher). |
| Annually | Check exhaust pipe for soot or corrosion. Replace if any holes or thin spots. |
| As needed | Clean intake air filter mesh. Replace if blocked. |
Chinese glow plugs cost £5–£10. Eberspacher glow plugs cost £25–£35. Both are straightforward to replace.
The Verdict
If you are building a weekend campervan that sees occasional use, buy a £100–£140 Chinese 2kW diesel heater from a UK-based seller with a returns policy. It will keep you warm, install in half a day, and if it fails after three years you have still spent less than a fraction of the premium alternative.
If you live in your van full-time, especially through UK winters, buy an Eberspacher D2 or Webasto Air Top 2000. Pay the £800–£1,000 for the unit and installation (or do it yourself — they are no harder to install than the Chinese units). The reliability at altitude, the serviceability, the lower noise, and the genuine 10+ year lifespan justify the cost.
And regardless of which you choose: buy a 2kW, not a 5kW. Your van does not need the extra output, and the short-cycling will drive you mad.
