How to Install a Duoetto MK2 Dual-Voltage Water Heater in Your Van or Caravan
Having instant hot water on the road can completely change your overlanding or van life experience. The Duoetto MK2 dual-voltage water heater is compact, efficient, and perfect for vans, camper trailers, or caravans. In this guide, we’ll show you how to install it safely and effectively, step by step.
Why the Duoetto MK2?
Before we dive in, here’s why the Duoetto MK2 is such a popular choice:
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Works on both 12V and 240V, so you can run it from your vehicle or shore power.
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Compact design that fits easily under benches or in small compartments.
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Provides instant hot water (once the tank is at temperature), perfect for washing up, showers, or cleaning gear.
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Easy to integrate with existing plumbing in your van or caravan.
What You’ll Need
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Duoetto MK2 dual-voltage water heater
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Water inlet and outlet hoses (usually 12mm or 15mm)
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Electrical cables for 12V and 240V connections
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Inline fuse (as per manufacturer’s recommendation)
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Mounting brackets or screws
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Wrenches, screwdrivers, and a drill
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Teflon tape or thread sealant
Step 1: Choose the Right Location
Pick a spot that:
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Is close to your water source and tap or shower.
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Has ventilation to prevent heat build-up.
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Allows for easy access for maintenance and wiring.
Pro tip: Most people install it under a kitchen bench or in a dedicated water compartment.
Step 2: Mount the Heater
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Use the supplied mounting brackets to secure the heater to a solid surface.
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Ensure it’s upright and stable to avoid vibration while driving.
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Drill pilot holes if needed, and avoid mounting near flammable materials.
Step 3: Connect the Water Lines
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Wrap Teflon tape around the threads of the inlet and outlet fittings.
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Connect the cold water line to the inlet and the hot water line to the outlet.
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Make sure all connections are tight but not over-tightened to prevent leaks.
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Test for leaks before finalising the installation.
Step 4: Wire the 12V System
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Connect the heater to your vehicle’s 12V battery via an inline fuse.
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Use appropriate gauge cables to handle the current draw.
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Connect the positive and negative terminals carefully, ensuring secure connections.
Step 5: Wire the 240V System (Optional)
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If you plan to run it from shore power, wire it according to the manufacturer’s 240V instructions.
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Make sure you isolate the 12V and 240V circuits to avoid electrical issues.
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Always follow safety protocols when working with mains electricity.
Step 6: Test the System
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Turn on your water supply and check for leaks.
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Switch on the 12V system and let it heat the water.
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Test the 240V system if connected.
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Confirm that hot water is flowing consistently and all electrical components are working safely.
Step 7: Enjoy Hot Water on the Road
Once installed, your Duoetto MK2 provides instant hot water (as long as you keep the tank at temperature) anywhere your van or caravan goes. Wash dishes, rinse off after a beach trip, or take a quick shower without relying on camp facilities.
Final Thoughts
Installing a Duoetto MK2 dual-voltage water heater is a straightforward upgrade that makes life on the road far more comfortable. With the right preparation and careful installation, you’ll enjoy reliable hot water for years to come.
For more tips on off-grid adventures, check out our other blogs:
