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Propex HS2000 LPG Heater wiring diagram

HS2000 with the April 2018-onward harness: 1.4 A running and 0.04 A standby from the manufacturer specification. Retain the supplied 5 A fuse, dedicated thermostat loom and uninterrupted power during the three-minute shutdown purge. 2 kW is heat output, not electrical draw.

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Compatible systems: 12 V
Continuous draw: 1.4 A

Wiring diagram

How the HS2000 is wired.

Open this example in Crimp to use your own parts and cable lengths. Review the assumptions and installation notes as you adapt the circuit.

Propex HS2000 LPG Heater wiring example with 3 components: House bank, Fused DC distribution, HS2000. 4 cable connections. Crossings are not junctions.Red = positive · dark = return · dashed = signal. Cable labels are example values; use the equipment instructions and actual installation lengths.

Retain supplied 5 A fuse and original power/thermostat loom. Heater-end supply must stay 10–15 V; let the approximately three-minute purge complete before disconnecting. This short example does not replace the supplied loom specification. Manufacturer installation manual

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Cable sizing for this example

Use the diagram as a starting point for your installation. Replace the example equipment and cable lengths with your own, and check the connections against your exact model's instructions.

1 m one way

12 V system

Wire: 1.5 mm² · 16 AWG
Example fuse: 5 A
Design current: 1.4 A
Voltage drop: 0.3%

Sized against ABYC E-11. The design current is the part's continuous draw. The length is one way; voltage drop includes an equal-length return.

Run-length and manufacturer assumptions

The editable example uses 3.048 m (10 ft) runs unless a shorter run is stated. Metric overviews round these to 3 m. Adapt the parts and lengths to your installation before choosing cable and protection.

Show sizes in AWG

Supporting parts

2 m total of 1.5 mm² (16 AWG) marine cable
Terminations for 1.5 mm² cable, matched to the equipment's screw terminals, leads or studs
5 A fuse and holder on the positive run
Heat-shrink, strain relief and terminal boots sized to the cable

Check stud sizes, fuse type, run length and how warm the space gets against the gear you actually have before you order.

Installation notes

Before you install.

Open a question for model-specific guidance and sources.

Verified against the manufacturer's documentation (rev. HS2000 from April 2018, issue 6, L180.121_0418), checked 2026-10-01. Manufacturer documentation →

Which HS2000 is covered?

This entry represents the 12 V LPG HS2000 with the April 2018-onward wiring arrangement. Propex's product specification lists 1.4 A operating current and 0.04 A standby. The 2 kW figure describes delivered heat, so it must not become a 2,000 W electrical load. Earlier controller and loom versions require their matching instructions.

Where do the wires go?

The wiring spread, PDF page 3, identifies the two-core power cable at CN24: red positive and black negative. The thermostat uses its supplied six-core loom at CN26/CN27. The catalog's thermostat terminal is a connector reminder, not a pin that accepts battery positive. Keep the original plugs and follow the diagram when routing the control cable.

What protection and supply are needed?

Retain the supplied 5 A fuse. The electrical instructions, PDF page 4, require 10–15 V at the heater. Measure that voltage during operation, including losses in both supply conductors. The manual does not give a universal replacement cable size or independent connector current rating; retain the supplied loom and obtain the appropriate extension specification when moving the supply farther away.

What must remain powered during shutdown?

Stop heating at the thermostat and allow the approximately three-minute fan purge to finish. A master switch that immediately removes power prevents that purge. Standby consumption is separate from heating duty; isolate for storage only after shutdown has completed.

How is the installation commissioned?

Use the manual's combustion-air, exhaust and warm-air routing together. Keep the specified 25 mm clearance, secure the flue system, and use the appropriate marine flue terminal for a boat installation. Have the gas installation checked by a competent installer, then confirm ignition, warm-air delivery, voltage at the heater and a complete shutdown purge. A successful electrical test alone does not verify the gas or exhaust installation.

Technical reference

Specifications and terminal map.

Check the model, ratings and connection points against your own unit before choosing installation hardware.

Catalog specification

Compatible systems: 12 V
Continuous draw: 1.4 A

Terminal map

Catalog connection points, current direction and planning limits. Check the manufacturer's pinout and connector ratings before installation.

TerminalPolarityRoleLimit

Red + / CN24

positive · input

positiveinput—

Black − / CN24

negative · input

negativeinput—

Thermostat loom

signal · bidi

signalbidi—

A dash means a current rating is not specified here.

Sources and sizing method

Equipment specifications. Model details, ratings and terminal roles come from the catalog. Check your unit’s label and current manufacturer documentation for its exact revision.

Example sizing. Sized against ABYC E-11. Boats built to UK or EU rules answer to ISO 13297 — check these figures against it before you build. Results use the example current and run length shown above. Set your actual equipment, lengths and installation conditions in Crimp before choosing hardware.

Read how the sizing works

Next step

Plan your installation with HS2000.

Open this example as a new project, or add this component to your existing diagram. Use your equipment and cable lengths to review the sizing.

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