JP Heater waterborne diesel heater 9 kW 12V

The JP Heater 9 kW hydronic diesel heater is a powerful and professional heating solution for larger boats, vehicles, and off-grid installations that require both high heating output and stable comfort.

It heats water (coolant) that circulates in a closed system with radiators, underfloor heating, or fan heaters. This provides even, quiet, and efficient heat distribution, similar to central heating at home.

With up to 9 kW, it is a solution that can easily cover larger areas or multiple cabins simultaneously.

⚡ Advantages

• Powerful 9 kW heating output – for larger installations
• Hydronic heating – even and comfortable heating
• Diesel operation – ideal for boats and vehicles
• Can heat both rooms and domestic hot water
• Less noisy than air heaters
• Suitable for multiple heating circuits
• Professional solution for serious setups

⛵ Suitable for

• Larger sailboats and motorboats
• Motorhomes and expedition vehicles
• Trucks and special vehicles
• Off-grid homes and cabins
• Those who want a central heating solution

📊 Specifications

General

• Output: up to approx. 9–9.1 kW
• Voltage: 12V DC (often 24V versions also available)
• Fuel: Diesel
• Type: Hydronic diesel heater

Fuel & Consumption

• Fuel consumption: approx. 0.19 – 1.0 liters/hour
• Electronic dosing pump
• Fuel type: Standard diesel

Power Consumption

• Power consumption: approx. 37 – 83 W during operation
• Low power consumption relative to output

Heating Performance (water)

• Heats coolant to approx. 70–80°C
• Circulation capacity: up to approx. 1650 l/hour
• Operating pressure: approx. 2.0 bar

Performance & Application

• Heating area: typically 30–80 m² (depends on system and insulation)
• Can supply multiple radiators / zones
• Can also be used for engine preheating

Dimensions & Weight

• Dimensions: approx. 385 × 133 × 193 mm
• Weight: approx. 4.2 – 5 kg

Operating Conditions

• Operating temperature: -40°C to +75°C
• Stable operation in harsh environments

Control

• Digital control panel
• Timer function
• Option for remote control / GSM control

🔧 Installation

This type requires a properly built hydronic system:

• Circulation pump (often included in kit)
• Expansion tank
• Radiators / fan coils
• Exhaust correctly routed
• Diesel connection

In return, you get a solution that functions as true central heating on board.

📦 Package Contents (may vary)

• Hydronic diesel heater
• Fuel pump
• Circulation pump (often included)
• Exhaust system
• Digital control panel
• Mounting parts

💡 Tip from SejlStrøm

If you're considering 9 kW, it's typically because:

✔ you have multiple rooms/cabins
✔ you want hot water + heating
✔ you want quick heating

A good rule of thumb:

• 5 kW → smaller boats / simple systems
• 9 kW → larger boats / full comfort solution