The Truma Combi D 4 E heats the living space AND your hot water from one compact diesel-fired unit — ideal for year-round campervan and motorhome use. It heats on diesel (staged up to 4 kW) drawn from the van's own fuel, with a built-in 230V electric element for quiet, fuel-free warmth on a mains hook-up — or run both together for the fastest warm-up. A 10-litre boiler gives ample hot water, all controlled from the supplied Truma iNet X panel or the free Bluetooth app.
Appliance
Truma Diesel Combi D4E Heater & Boiler iNet X Package
The Truma Combi D 4 E heats the living space AND your hot water from one compact diesel-fired unit — ideal for year-round campervan and motorhome use.
The Truma Combi D 4 E heats the living space AND your hot water from one compact diesel-fired unit — ideal for year-round campervan and motorhome use. It heats on diesel (staged up to 4 kW) drawn from the van's own fuel, with a built-in 230V electric element for quiet, fuel-free warmth on a mains hook-up — or run both together for the fastest warm-up. A 10-litre boiler gives ample hot water, all controlled from the supplied Truma iNet X panel or the free Bluetooth app.
Diesel combi heaterHeating up to 4 kW10 L hot water230V electric elementiNet X app control
Specifications
Heating
Diesel warm-air + water heater (combi)
Diesel output staged: 1 / 2 / 3 / 4 kW
Summer mode (water only): ~2 kW
Max airflow: 287 m³/h
Hot water
10-litre boiler
Water 15→60°C: ~20–24 min
Heating + water together: ~80 min
Electric element (the "E")
230V output: 900 / 1800 W
Diesel + electric mixed: up to ~3.8 kW
230V draw: 3.9 / 7.8 A
Fuel & power
Diesel to EN 590 (van tank or separate tank)
Consumption: 0.1–0.4 l/h
12V supply: 0.4–8.1 A in use
Size & weight
510 × 450 × 300 mm
~15.6 kg empty
Control
Truma iNet X panel (supplied)
Free iNet X app — Bluetooth from your phone
Add iNet X Connect for remote access
In the iNet X package
Combi D 4 E unit, iNet X panel + 6 m cable
Diesel exhaust/flue kit with wall cowl
Warm-air duct kit + FrostControl valve
Fuel line, take-off, terminals + instructions
Expert help, any time
Not sure it's right for your van or build? Contact us any time for expert guidance. No question is too small, and we can fit it as part of your VANZ conversion.
"Vantastic. Lee kept in touch throughout the build with phone calls / video calls this is how a business should be ran. There is no communication between companies nowadays they should take note from start to the finished fit out excellent workmanship thanks Lee"
It runs on diesel from your van's own fuel supply (or a separate tank), so there are no gas bottles to store, refill or swap — handy for self-builds and full-time travel. Heating and hot-water performance match the gas Combi 4E.
How much hot water does it give?
It has a 10-litre boiler heated by the same burner. From cold (15°C) the water reaches about 60°C in roughly 20–24 minutes — enough for washing up and showers for two — and it reheats as you use it.
What is the electric element for?
The "E" is a built-in 230V heating element (900W or 1800W). On a mains hook-up you can heat on electricity instead of diesel — silent and fuel-free — or combine diesel and electric together ("mixed mode", up to ~3.8 kW) for the quickest warm-up.
Can I control it from my phone?
Yes. The package includes the Truma iNet X panel, and the free Truma iNet X app connects over Bluetooth so you can set temperature, hot water and timers from your phone or tablet. Add the iNet X Connect module for remote access when you are away from the van.
Can I fit it myself, or do I need a professional?
A diesel combi involves a fuel take-off, a flue through the floor or wall, a 230V mains connection and FrostControl plumbing. Confident self-builders do fit them, but professional installation is strongly recommended — and fitting to Truma's instructions is required to keep the warranty valid. We can supply and fit it as part of a VANZ conversion.
What does it come with, and what else will I need?
The iNet X package includes the unit, iNet X panel and 6 m cable, the diesel exhaust/flue kit with wall cowl, a warm-air duct kit, the FrostControl valve, fuel line, take-off, terminals and instructions. You will usually still need extra warm-air ducting and outlets to suit your layout.
What warranty does it have?
Covered by Truma's manufacturer warranty — 2 years as standard, extendable to 5 years when you register the product with Truma and it's installed and maintained to their instructions. Register your unit after fitting to activate the extended cover.
