A newer Combi architecture
CombiNeo 4 E combines space heating and domestic hot water, but it is not simply another name for the older Combi 4 E. Truma publishes different water capacity, heating behaviour and performance figures for the Neo generation.
This exact-model distinction is important when reading camper specifications. Data from older Combi heaters should not be copied into a CombiNeo 4 E record.
Room heating on gas
For room heating, the 4 E model uses 1.8 and 4.4 kW gas stages. Truma lists gas consumption from 135 to 460 g/h.
These are appliance ratings. Actual propane use during a night depends on how often and at which level the heater operates, which in turn depends on temperature, insulation and ventilation.
Electric heating from 230 V
CombiNeo 4 E provides 1, 2 or 3 kW electric heating from 230 V. The corresponding published current levels are 4.4, 8.7 and 13.1 A.
MHS explanation.A campsite connection with a limited current allowance may not support the highest electric level together with a kettle, air conditioner or other large load. The complete shore-power budget matters.
Hybrid mode
In hybrid room-heating operation, gas and electricity can be combined for up to 5.4 kW on the 4 E version. For water heating, Truma lists up to 7 kW in gas/hybrid operation.
“Hybrid” in this context means combining the heater's available energy sources. It does not describe a vehicle hybrid drivetrain or imply a smart whole-camper energy manager.
Why the water system is only 5.6 L
Truma lists 5.6 L water capacity at a nominal pressure of 2 bar. The CombiNeo uses a different hot-water concept from a conventional larger storage boiler.
The manufacturer describes hot water for washing up after about three minutes and shower availability after a specified warm-up period, subject to flow and temperature conditions. Treat these as documented test/use conditions, not unlimited hot water under any circumstance.
The meaning of “endless” shower language
Truma's product information explains that the endless-shower statement depends on conditions including a temperature difference of no more than 25°C, a 3.5 L/min flow, and ongoing gas, electricity and water supply.
MHS explanation.That is not a promise that a finite fresh-water tank or grey-water tank becomes irrelevant. The camper's water capacities still define real autonomy.
Airflow and electrical demand
Maximum warm-air flow is listed as 310 m³/h. On the 12 V side, room-heating consumption is 0.4–4.8 A; water heating is 0.4–3.8 A.
The heater therefore still depends on the service battery even when gas provides most of the heat. A low battery can matter during cold-weather operation.
Water pressure
The published maximum pump pressure is 2.8 bar and maximum system pressure 4.5 bar. These figures are design limits, not recommended pump settings.
The entire camper plumbing should use compatible regulation and protection, especially when connecting to an external water supply.
Weight and installation
The appliance itself is listed at 13.4 kg without water and peripherals; with documented peripherals it is 14.6 kg, and with water plus peripherals about 20.2 kg.
For payload planning, confirm which figure is relevant. The installed system also includes ducts, gas hardware and plumbing that are not represented by the dry appliance weight alone.
What to check in a camper
Confirm the label says CombiNeo 4 E. Check the 230 V supply, 12 V battery support, gas installation, water-pressure arrangement and winter drain procedure.
Because this is a newer generation, keep its operating and installation documents with the camper instead of relying on instructions for a previous Combi model.
Key takeaway
CombiNeo 4 E combines gas, up to 3 kW electric heating and a fast hot-water concept. Its practical value depends on shore-power limits, 12 V supply, gas, water flow and the camper's fresh/grey-water capacity.
Source
Truma — CombiNeo E Product Information Rev.01 08/2025
CombiNeo 4 E only. Product information is Rev.01 dated 08/2025 and notes retail availability from late 2026.