6kW 12V LPG Gas Combi Air & Water Heater | Truma Combi 6E Replacement

🔥 One Unit. Air + Hot Water. Zero Drama.

Stop bolting two appliances to your van wall. The 6kW LPG combi boiler does both jobs — heats the cabin air AND your shower water — from a single propane burn, single 12V control, single install footprint. Designed as a direct drop-in replacement for the Truma Combi 6E, this combi heater delivers 6kW of heating power (≈20,500 BTU/h) for both space heating and domestic hot water in your motorhome, campervan, travel trailer, or fifth wheel.

Why Choose a Combi Heater Over Separate Units?

Traditional RV setups require two separate appliances: a furnace for space heating and a water heater for showers. That means two propane lines, two 12V power draws, two exhaust vents, two installation bays, and twice the maintenance. A combi boiler consolidates everything into one compact unit:

• Single propane connection — one gas line, one regulator
• Single 12V control — draws just 3A, compatible with standard RV battery systems
• Single exhaust — sealed combustion with balanced flue for safe indoor installation
• Single footprint — drop-in replacement for Truma Combi 6E cutout (460×450×270mm)
• Lower total cost — one appliance instead of two means lower purchase price and less maintenance

Why This Combi, Not “Combi-Style”

Some “combi” units on the market are simply a furnace tacked onto a water tank — two separate heat exchangers sharing a housing. This is a true combi system with an integrated heat exchanger, 10L stainless steel water circuit, sealed combustion chamber, and a 3-port motorized valve that directs heat to air, water, or both simultaneously. One flame, two outputs, no compromises.

Technical Specifications

Drop-In Replacement for Truma Combi 6E

If your RV currently has a Truma Combi 6E installed, this unit is designed as a direct replacement. The mounting footprint, gas connection location, 12V wiring harness, and ducting connections all match the Truma Combi 6E specification. In most cases, installation takes 2-4 hours and requires no modifications to your existing RV infrastructure.

Compatible Truma models include:

• Truma Combi 6E (12V)
• Truma Combi 6E CP Plus
• Truma Combi 4E (upgradable to 6kW)
• Truma Combi D 6E (diesel version — gas conversion available)

Installation Guide

Before You Begin

1. Disconnect 12V power at the battery
2. Turn off propane supply at the tank
3. Allow the old unit to cool completely
4. Verify the cutout dimensions: 460 × 450 × 270mm

Installation Steps

1. Remove old unit: Disconnect gas line, 12V wiring, ducting, and water connections. Remove mounting screws.
2. Prepare mounting surface: Clean the cutout area, verify no obstructions in the exhaust path.
3. Mount new unit: Slide the combi heater into the cutout. Secure with the included mounting screws (4 corners).
4. Connect gas: Attach propane line using the included 8mm gas fitting. Test for leaks with soapy water.
5. Connect 12V power: Red wire to positive (+), black wire to negative (-). Use 14AWG minimum wire gauge.
6. Connect water lines: Cold water inlet (bottom left), hot water outlet (bottom right). Use 12mm PEX or copper tubing.
7. Connect ducting: Attach hot air outlet (top) to existing RV ductwork using 65mm flexible duct.
8. Install exhaust: Attach balanced flue exhaust to the rear of the unit. Route through the exterior wall with the included vent cap.
9. Fill and test: Fill the water tank, open a hot tap to purge air. Reconnect 12V power, turn on propane, test both air and water heating modes.

Which RVs Is This Suitable For?

This 6kW combi heater is suitable for a wide range of recreational vehicles and mobile living spaces:

• Class A motorhomes — up to 35ft
• Class B campervans — Sprinter, Transit, Promaster conversions
• Class C motorhomes — up to 30ft
• Travel trailers — up to 28ft
• Fifth wheels — up to 32ft
• Truck campers — full-size and short-bed
• Horse trailers — living quarters conversions
• Off-grid cabins — tiny homes, shepherd’s huts, container conversions

For vehicles larger than 35ft, we recommend supplementing with additional ducted heat exchangers or a second combi unit for zone heating.

Frequently Asked Questions

Q: Is this a genuine Truma product?

A: No, this is a high-quality aftermarket replacement manufactured to meet or exceed Truma Combi 6E specifications. It is designed as a direct drop-in replacement and carries CE certification. It is not affiliated with or endorsed by Truma/Spheros.

Q: Can I use this with my existing Truma control panel?

A: The unit comes with its own digital control panel. For existing Truma CP Plus panels, an adapter cable is available (sold separately). Contact our technical team for compatibility confirmation.

Q: How long does a 20lb propane tank last?

A: At full 6kW output, a 20lb (9kg) propane tank lasts approximately 18-22 hours of continuous operation. In typical RV use (cycling on/off, mixed air/water mode), most users get 3-5 days per tank.

Q: Does it work at high altitude?

A: The unit is rated for operation up to 2,000m (6,500ft) above sea level. Above 2,000m, an altitude adjustment kit is recommended (available on request) to maintain optimal combustion efficiency.

Q: What is the warranty?

A: 2-year manufacturer warranty on the heat exchanger and combustion chamber, 1-year warranty on electronic components. Extended warranty available for up to 5 years.

Q: Can I install this myself?

A: If you are comfortable with basic RV maintenance (propane connections, 12V wiring, plumbing), installation is straightforward. However, gas connections should always be pressure-tested for leaks. We recommend professional installation if you are unfamiliar with LP gas systems.

Q: How noisy is it?

A: The combustion fan operates at 45-55 dB, comparable to a normal conversation. Most users install it in an exterior compartment or under-bed storage where noise is barely noticeable inside the living area.

Related Products

Looking for other RV heating and sanitation solutions? Check out these related products:

• RV Biodegradable Smart Toilet – Micro-Composting System — Eco-friendly waterless sanitation for off-grid RV living
• 12L Propane RV Water Heater — Standalone LPG water heater for smaller RVs
• RV Furnace Blower Motor — Replacement blower motor for Suburban/Atwood furnaces

Why Buy From IntelliGenParts?

• Technical support: Our engineering team can verify compatibility with your specific RV model
• Free shipping: Air freight to major cities worldwide within 7-14 days
• Duties included: All prices include import duties and taxes — no surprises at delivery
• CE certified: Meets European safety standards for gas appliances
• 2-year warranty: Comprehensive coverage with responsive after-sales support

Ready to upgrade your RV heating system? Order today and enjoy the convenience of a single combi unit for all your heating and hot water needs. Have questions about compatibility? Contact our technical team — we typically respond within 24 hours.