What makes comfort plus different
Truma Combi comfort plus combines space heating and domestic hot water in one North American appliance. Its distinguishing feature compared with Combi eco plus is the additional third propane operating level of 20,400 BTU/h / 6 kW, intended for larger vehicles.
The product can heat the cabin, heat its integrated 10 L water tank, or do both depending on the selected operating mode.
Three propane levels
Truma publishes gas input levels of 7,500, 14,300 and 20,400 BTU/h. Corresponding fuel consumption is 150, 290 and 410 g/h.
These are burner operating levels, not a fixed nightly fuel use. The thermostat and control system cycle or select output according to the heat demand, outside temperature and the camper's thermal characteristics.
Electric heating from 120 V
The integrated electric elements provide 850 W or 1,700 W. Truma lists 7.1 A and 14.2 A on the 120 V side.
MHS explanation.A campsite circuit with limited current may not support the highest electric stage together with an air conditioner, kettle or other large load. Shore-power planning still matters even though the heater has its own controls.
Mixed mode
In mixed operation, propane and electric heat can be used together. Truma lists the mixed rating as 14,300 BTU/h (4.2 kW) plus 1,700 W electric.
Do not create a new “total” rating by simply adding every published maximum from different modes. Use the manufacturer's mode definitions.
Integrated 10 L hot-water tank
The water tank holds 2.64 US gal / 10 L. Truma states approximately 23 minutes to heat the water from 59°F to 140°F in hot-water mode.
The 10 L figure is hot-water storage inside the appliance. At a shower the hot water is mixed with cold water, so usable mixed volume depends on inlet temperature, chosen outlet temperature and flow.
Why the largest Combi still needs 12 V
Propane and 120 V electricity provide heat, but the controls and blower depend on the RV's 12 V electrical system. Truma publishes a transient maximum of 6.1 A on the 12 V side.
A full propane cylinder therefore does not guarantee heating if the house battery is too low to run the electronics and fan.
Water pressure limits
Maximum inlet pressure is listed as 40.6 psi / 2.8 bar and maximum system operating pressure as 65.3 psi / 4.5 bar.
These are equipment limits, not recommended pump settings. The pump, regulator, tubing and other fixtures must all be compatible with the actual water pressure.
Weight and installation space
The appliance weighs 37.0 lb / 16.8 kg and measures approximately 465 × 523 × 300 mm.
That is the product body. Installation also needs room for gas, water, electrical connections, warm-air ducts and service access. A compact equipment bay should be judged by the installation manual, not body dimensions alone.
Warm-air distribution matters
A powerful furnace can only heat the camper evenly if the duct layout distributes warm air effectively. Long runs, closed outlets and poor return-air paths can create hot and cold zones.
MHS explanation.The extra 20,400 BTU/h level is useful only when the rest of the heating system can distribute that output without restriction.
Summer hot-water operation
The water can be heated independently of cabin heating. This is useful in warm weather when an owner needs a shower or sink water but does not want to warm the living space.
That separation is one of the practical advantages of a combined furnace/water-heater architecture.
Interconnect and CP plus
Truma describes integration with its control ecosystem, including the CP plus already installed in compatible systems and Truma Interconnect capabilities with supported Truma air conditioning.
This does not prove that every camper with Combi comfort plus has a Truma air conditioner or complete automatic climate system. Those components need their own evidence.
Winterizing
The integrated water tank has to be drained as part of winter preparation. Truma's published procedure begins by switching off the water pump, disconnecting city water where applicable and opening water outlets before draining.
The camper manufacturer may add bypass valves or other low points. Use the complete camper winterizing procedure rather than only the heater page.
What to check in a camper
Confirm the exact Combi comfort plus label. Do not confuse it with eco plus or European Combi 6 E simply because the maximum gas output is similar.
Test gas heating, electric heating and hot water separately. If mixed mode is important, test it on an adequate shore connection. Also confirm where the drain and service access are located.
Why MHS links only one Bigfoot right now
Bigfoot offers Combi Comfort Plus as an option on several models, but availability is not the same as installed equipment. In the current MHS evidence, the 25C9.6LB Factory-Max configuration explicitly selects Combi Comfort Plus.
The other Bigfoot models remain unlinked until their selected configuration or an actual build confirms the component.
Key takeaway
Combi comfort plus is the higher-output North American Combi with a third 20,400 BTU/h propane level, electric heat and integrated 10 L hot water. The real system still depends on 12 V power, shore-current limits, ducting and water-system design.
Source
Truma — Combi comfort plus
North American Truma Combi comfort plus. Availability as a factory option is not treated as installation without selected-configuration evidence.