JP Heater Combi Diesel Water and Air Heater 4 kW 12V – for Camper & Boat

The JP Heater Combi 4 kW diesel is a complete heating solution for those who want both cabin heating and hot water in one single unit – without relying on gas.

It is particularly suitable for boats that already have diesel on board, and want a simple, safe, and efficient solution for both heating and hot domestic water.

With 4 kW heating power, it delivers stable heat in small to medium-sized installations, while also producing hot water for bathing, washing dishes, and daily use.

⚡ Advantages

• Combines air heating and hot water in one unit
• Diesel operation – easy integration into boat or vehicle
• 12V solution – perfect for off-grid setups
• Low power consumption and efficient operation
• Stable heating in cold and damp environments
• No need for gas installation
• Compact and space-saving solution
• Ideal for boats, vans, and smaller installations

⛵ Suitable for

• Sailboats and motorboats
• Motorhomes and vans
• Smaller off-grid cabins
• Allotment houses without gas installation
• Those who want a combined solution for heating and water

📊 Specifications

General

• Power: 1 / 2 / 4 kW (stepless regulation)
• Voltage: 12V DC
• Fuel: Diesel
• Heating type: Air + water (combi)

Fuel & consumption

• Fuel consumption: approx. 0.12 – 0.4 liters/hour
• Fuel pump: electronic dosing pump
• Fuel type: Standard diesel

Power consumption

• Startup consumption: approx. 8–10 A
• Operating consumption: approx. 1–3 A
• Low standby current

Heating performance (air)

• Airflow: approx. 120 – 200 m³/hour
• Heated area: approx. 10–40 m² (depends on insulation)
• Multiple air outlets for even heat distribution

Water & hot water function

• Built-in hot water tank: 10 liters
• Water temperature: approx. 40°C – 60°C
• Max. water pressure: approx. 2.5 – 3 bar
• Ready for bathing, dishwashing, and daily use

Dimensions & weight (estimated)

• Dimensions: approx. 450 × 300 × 300 mm
• Weight: 13 kg (without water)

Operating conditions

• Operating temperature: down to approx. -40°C
• Stable operation in humid and cold environments

Control

• Digital control panel
• Temperature control
• Timer function
• Automatic fault detection

🔧 Installation

Installation requires a bit more than a regular air heater, as both air, diesel, and water need to be connected – but it is still manageable for many.

It is important to:

• route exhaust correctly
• ensure correct diesel supply
• install water connections and possibly a pressure pump correctly
• ensure good ventilation around the unit

📦 Package contents (may vary)

• Combi diesel heater unit
• Fuel pump
• Exhaust system
• Air hoses and distributors
• Water connections
• Control panel
• Mounting parts

💡 Tip from SejlStrøm

This model is ideal if you want to keep it simple and run a 100% diesel-based setup on board.

I typically recommend combining it with:

• a lithium battery (low power consumption = longer operating time)
• solar panels to keep the system running without the engine

This way, you have a solution that provides both heating and hot water – completely independently.