Autoterm Monoboil – Electrical Hot Water Boiler 3L, 4L & 6L

Autoterm Monoboil is a compact electrical hot water boiler designed for motorhomes, campervans, caravans, service vehicles, off-grid systems and marine applications.
It is available in three sizes – 3 litre, 4 litre and 6 litre – allowing you to choose the right capacity depending on available space and hot water demand.

Monoboil operates on 230V shore power and is ideal when connected to campsite electricity, marina power supply or an external power source.
The stainless steel tank, compact dimensions and low weight make it easy to install even in confined technical spaces.

It is especially popular in van conversions where a simple, reliable and gas-free hot water solution is preferred.
 

Available Models

Monoboil 3L (AT03)
Power output: approx. 500 W
Compact solution for smaller vehicles and limited installation space
Fast heating of small water volume
Ideal for sink use and light shower setups

Monoboil 4L (AT04)
Power output: approx. 500 W
Balanced capacity and size
Most common choice for campervan installations
Suitable for short showers and dishwashing

Monoboil 6L (AT06)
Power output: approx. 750 W
Larger hot water reserve
Suitable for motorhomes, larger van builds and marine use
Improved comfort for shower applications

Key Advantages of Autoterm Monoboil

230V electric operation – no gas required
Compact design for easy installation
Stainless steel tank for long service life
Integrated overheat protection
Safe and robust construction
Simple integration into pressurised freshwater systems

Monoboil is a pure electric solution and performs best when connected to shore power or a sufficiently sized inverter system.

Technical Overview

Operating voltage: 230V AC
Built-in thermostat control
Maximum temperature: approx. 65–70°C
Connections for pressurised water systems
Insulated tank to reduce heat loss
Compact dimensions suitable for installation inside cabinets or technical compartments

What Is Required for Installation?

For a complete Monoboil installation, the following components are typically required:

12V or 24V pressure water pump (depending on system)
Expansion tank to reduce pressure spikes
Safety / pressure relief valve
Non-return valve
Mixer tap with shower hose or faucet
Hot-water-rated PEX tubing or flexible hoses
Shut-off valves
230V electrical supply with correct fuse protection
Residual current device (RCD) in the electrical system

Installation in motorhomes or boats should always follow local electrical safety regulations.

Which Size Should I Choose?

3 litres is suitable if installation space is limited and hot water is mainly required for sink use.
4 litres is a versatile all-round solution for standard campervan use.
6 litres is recommended if comfort is prioritised and shower use is frequent.

If you are unsure, we are happy to help you dimension the correct system based on vehicle type and intended usage.

Applications

Motorhomes
Campervans
Caravans
Service vehicles
Marine installations
Off-grid systems with inverter and shore power

Why Buy Monoboil from Värmarcenter?

Professional technical advice before purchase
Experience with electric and hydronic systems
Installation support
Fast deliveries
We can supply complete hot water system packages

Contact us if you would like assistance building a complete hot water system tailored to your vehicle.