As an authorized Webasto partner for over a decade, our team at JPC Direct knows these units inside out. If you are planning a DIY installation or simply want to understand how our marine engineers build these systems, this guide breaks down the core structural steps to achieving a safe, reliable set-up.

Is the Webasto Thermo Top EVO Right For Your Boat?

The Thermo Top EVO (5kW heat output) is ideally engineered for compact to medium-sized vessels up to roughly 50 feet.

It is perfect for:

• – Narrowboats and Cruisers: Providing evenly distributed radiator warmth from bow to stern.
  
  
• – Live-aboards: Boaters who require constant domestic hot water alongside space heating.
  
  
• – Multi-Cabin Vessels: Where running large, rigid hot-air ducting through bulkheads is physically impossible. Water lines are significantly smaller and easier to route.
  

The 5-Step Webasto Thermo Top EVO Installation Process

Installing a marine water heater requires balancing plumbing, electrical, fuel, and exhaust connections. To ensure peak reliability and safety, follow these steps in order.

Step 1. Select and Mount The Base Unit

Find a dry, protected location like a lazarette or engine room that is well clear of gas storage. Mount the heater as low as possible in the vessel using the heavy-duty bracket. Keeping it low is critical because the included coolant circulation pump is not self-priming and relies on gravity to stay flooded.

Step 2. – Plumb the Coolant Circuit

Route your plumbing lines to connect the heater to your matrix blowers, towel rails, radiators, or your water calorifier. Use high-grade marine hose and ensure the loop includes a header tank at the highest point of the system to facilitate easy automatic air-bleeding during operation.

Step 3. – Install the Marine Exhaust System

Connect the 24mm stainless steel exhaust pipe. For safety, you must create a “swan neck” (an upward loop) in the pipe right before it reaches the hull skin fitting to prevent water ingress from waves. Wrap the entire exhaust pipe length in a woven glass insulating sock to protect nearby components from high temperatures.

Step 4. – Integrate the Fuel Supply

Mount the Webasto fuel dosing pump externally using its rubber anti-vibration mount to keep clicking noises out of the cabin. Run the copper or rigid plastic fuel lines from your primary diesel tank. Ensure all connections utilize fuel-grade rubber sleeves and secure clips to prevent air leaks.

Step 5. – Connect Electrics and Controllers

Route the wiring loom back to your boat’s main 12V or 24V battery bank, incorporating the specified inline fuses. Connect the digital MultiControl panel or modern SmartControl unit inside your main cabin living space to complete the system circuit.

Safety Checks for Boat Safety Scheme (BSS) Compliance

When installing any diesel-fired appliance on a vessel in the UK, your installation must adhere to strict safety codes. Skipping these details can cause your boat to fail its next BSS inspection:

• – Leak-Proof Exhaust Joints: Every single exhaust connection must be completely gas-tight using correct exhaust paste and heavy-duty clamps. Carbon monoxide poisoning is a major hazard. All exhaust work should preferably be undertaken by a qualified professional.
  
  
• – Transom Skin Fittings: Ensure your hull exhaust skin fitting is positioned high enough above the waterline to avoid being submerged by the boat’s bow wave or heavy beam seas.
  
  
• – Fire-Resistant Fuel Lines: Use proper marine-grade fuel lines that can withstand high temperatures without degrading.

Webasto Thermo Top EVO System Diagram

Webasto Thermo Top EVO Installation – FAQs

Why Choose JPC Direct for Your Installation?

Choosing the right heating system is only half the battle – the quality of the installation determines how reliably it performs when the temperature drops. At JPC Direct, we are more than just an online retailer; as certified Webasto main dealers with over a decade of hands-on marine engineering experience, we ensure your Thermo Top EVO is integrated perfectly with your vessel’s unique layout.

Whether you need expert advice on plumbing loops, a fully BSS-compliant installation kit, or the peace of mind that comes with our exclusive 3-year on-board warranty, our friendly Norfolk-based team is here to support you from project blueprint to final safety check.

The post Installing a Webasto Thermo Top EVO on Your Boat: The JPC Direct Guide appeared first on JPC Direct.

This guide explains the installation process step by step, who it’s for, and how to choose the right Sleipner stern thruster for your boat. It’s written for owners who want a neat, reliable installation and a better feel at the helm without getting lost in too much technical jargon.

Why fit a stern thruster?

A stern thruster helps push the back of the boat sideways, giving you much more control when manoeuvring astern or positioning the boat in tight spaces. It’s especially useful on longer boats, heavier boats, or craft with a high windage profile.

For many boat owners, the biggest benefit is confidence. Instead of fighting the boat, you can make small adjustments and bring it into place more smoothly.

Key Benefits of Fitting A Stern Thruster

• – Easier docking and reversing.
  
• – Better control in wind and current.
  
• – Less stress in tight marina spaces.
  
• – Cleaner low-speed manoeuvring.
  
• – More confidence at the helm.

What We Check Before Fitting

• – Boat length and weight.
  
• – Stern space and access.
  
• – Hull shape and structure.
  
• – Required thrust level.
  
• – Control position at the helm.
  
• – Wiring route and power supply.
  
• – Adequate space around the waterline for installation

How We Install A Stern Thruster

• – Choose the right thruster model.
  
• – Mark the installation position.
  
• – Cut and prepare the opening.
  
• – Fit the stern tunnel and/or mount the unit.
  
• – Install the propellers.
  
• – Run the electrical wiring.
  
• – Fit the joystick or helm control.
  
  

Step 1: Choose the right thruster model

Before any cutting or fitting begins, we first make sure the thruster is suitable for the boat. That means looking at the hull shape, available stern space, boat length, and how much control the owner wants.

This is important because a thruster that is too small may not give enough sideways force, while one that is too powerful may be unnecessary for the boat.

Step 2: Mark the installation position

Once the right model has been selected, we mark out the best position on the stern. For best performance, Sleipner stern thrusters should be installed as deep on the stern as practical, while still allowing a proper, safe fit.

Getting this right helps the system work efficiently and keeps the installation clean and balanced.

Step 3: Cut and prepare the opening

The next stage is to cut the stern opening for the unit (SX Series) , or the stern tunnel (SE Series), and prepare the area for the thruster system. This must be done carefully so the unit sits correctly and the surrounding structure stays strong.

We always aim for a neat, well-sealed installation. That matters not just for appearance, but for long-term durability and performance too.

Step 4: Fit the tunnel and mount the unit

Once the opening is ready, the tunnel is fitted and sealed into place. The thruster assembly is then mounted so the mechanical parts align properly with the tunnel.

This step is one of the most important parts of the job. A precise fit helps reduce vibration, noise, and wear.

Step 5: Install the propellers

After the main unit is in place, the propellers are fitted according to the model specification. On some Sleipner stern thrusters, prop orientation is important, especially on twin-propeller or counter-rotating systems.

Getting the propellers fitted the right way round is essential for good thrust and predictable handling.

Step 6: Run the electrical wiring

The next stage is wiring the thruster back to the control system at the helm. This includes the power supply, control wiring, and any relevant connectors or harnesses.

We keep this part tidy and secure, because good wiring is just as important as the mechanical installation. It helps the system respond properly when you need it.

Step 7: Fit the joystick or helm control

A stern thruster is only useful if it’s easy to operate. That’s why we fit the joystick or control panel in a position that feels natural from the helm.

This gives you simple fingertip control when manoeuvring and makes the system feel like part of the boat rather than an afterthought.

Step 8: Test the full system

Before we finish, we test the full installation carefully. That means checking the thruster response, control operation, alignment, and overall performance.

We also look for anything that might affect reliability, such as loose fittings, wiring issues, or excessive noise. The final test confirms everything is ready for use.

Which thruster suits which boat?

Sleipner offers several stern thruster options, and the right choice depends on boat length, weight, and how the vessel is used. As a general rule, smaller boats need less thrust, while larger or heavier boats need more power and sometimes twin-propeller or retractable systems.

Stern Thruster Installation FAQs

The post Sleipner Stern Thruster Installation: Step-By-Step Guide appeared first on JPC Direct.

This guide explains the installation process step-by-step in plain English, so you know what’s involved before you book a fitting. It’s designed for boat owners who want a reliable bow thruster set-up, a neat finish, and a system that works properly from day one.

What this guide covers

We’ll walk you through the main stages of a typical Sleipner bow thruster installation. That includes choosing the right location, fitting the tunnel, mounting the thruster, wiring the controls, and testing everything at the end.

Why fit a bow thruster?

A bow thruster helps push the bow sideways, creating lateral propulsion, which makes docking and close-quarters handling much easier. It’s especially useful on boats where wind, current, or limited space make manoeuvring more difficult.

For many owners, the biggest benefit is confidence. Instead of fighting the boat into position, you get smoother control and less stress when coming alongside.

Why Choose A Sleipner Thruster?

Sleipner is one of the marine industry’s most respected names, known for its wide range of high-performance bow and stern thrusters, stabilisation systems, and advanced control technology. Designed and manufactured in Norway, Sleipner products are used on everything from smaller leisure boats to larger yachts and commercial vessels, and the brand has built its reputation on reliability, innovation, and ease of use. Their market-leading thruster systems are developed to deliver strong maneuvering performance while also improving onboard comfort and safety, making them a trusted choice for boatbuilders and owners around the world.

Key Benefits of A Bow Thruster

• – Easier docking.
• – Better low-speed control.
• – Less stress in wind and current.
• – A cleaner, more professional finish.
• – Reliable joystick control from the helm.

How we install a Sleipner Bow Thruster

• 1. Choose the right thruster set-up.
• 2. Mark the tunnel position.
• 3. Cut and fit the tunnel.
• 4. Mount the thruster unit.
• 5. Install the propellers.
• 6. Run the wiring.

Step 1: Choose the right thruster set-up

Before any cutting or fitting begins, we first make sure the thruster model suits the boat. The right setup depends on the vessel’s size, hull shape, weight, and how the boat is used.

This is where proper planning matters. A thruster that is too small won’t give enough control, while one that is oversized can be unnecessary and inefficient.

Step 2: Mark the tunnel position

Once the correct thruster has been selected, the tunnel position is marked out carefully. This needs to be in the right place on the hull so the thruster works efficiently and sits correctly in the boat.

Accuracy matters here. If the tunnel is misaligned, it can affect performance and create unnecessary drag or noise.

Step 3: Cut and fit the tunnel

The next stage is to cut the hull opening and fit the tunnel tube. This is one of the most important parts of the job, because the tunnel forms the housing that allows the thruster to work properly.

The tunnel must be installed securely, sealed correctly, and positioned so it sits true to the hull. A good fit here helps the thruster perform smoothly and reduces the chance of long-term problems.

Step 4: Mount the thruster unit

With the tunnel in place, the thruster unit itself can be mounted. This includes fitting the motor, drive components, and lower section in line with the tunnel assembly.

We make sure everything is aligned properly so the unit runs as intended. That alignment helps keep the installation quiet, efficient, and reliable.

Step 5: Install the propellers

Once the mechanical parts are in position, the propellers are fitted. On single and twin-propeller models, the direction and side placement need to be correct for the thruster to work properly.

This is a detail that may seem small, but it makes a big difference to performance. Installing the propellers the right way round is essential for smooth thrust and proper control.

Step 6: Run the wiring

After the physical installation is complete, we connect the electrical system. This includes the wiring from the thruster motor to the helm control or joystick.

We keep the cable runs tidy and protected, and we make sure the connections are secure. Good wiring helps the thruster respond reliably when you need it most.

Step 7: Fit the helm controls

The next stage is installing the joystick or control panel at the helm. This gives you simple control over the thruster from the driving position.

We place the controls where they are easy to reach and natural to use. That way, the thruster becomes a practical part of handling the boat rather than something awkward to operate.

Step 8: Test the installation

Once everything is fitted, we test the full system. That means checking the motor, propellers, controls, wiring, and overall operation.

We also confirm that the unit responds properly under load and that there are no issues with alignment, noise, or vibration. This final step is what turns a fitted thruster into a dependable piece of onboard kit.

Sleipner Bow Thruster Installation – FAQs

The post Sleipner Bow Thruster Installation: Step-By-Step Guide appeared first on JPC Direct.

At JPC Direct, we install marine heaters for customers who want to extend their season, improve comfort onboard, and make weekends away more enjoyable. This guide explains the installation process in plain English, so you know what’s involved before you book a fitting.

NB: All Webasto heater installations by JPC Direct will be subject to a 3-Year Parts and Labour Warranty, and will guarantee expert after-market technical support.

Before we begin

Before any installation, we make sure the heater is the right size for the boat and the spaces it needs to warm. We also check where the unit can safely sit, where the fuel supply will come from, how the exhaust will be routed, and where the warm air will be delivered.

A good installation is not just about fitting a heater. It’s about making sure the whole system works efficiently, safely, and neatly for the long term.

Why install a Webasto Air Top heater?

A Webasto Air Top is a diesel-powered cabin heater that warms the air inside your boat and circulates it through ducting into living spaces. It’s a popular choice for cruisers, narrowboats, and other leisure craft because it provides quick heat, takes up little space, and can be controlled easily from inside the cabin.

For many boat owners, the big advantages are simple: warmer mornings, less condensation, and a more comfortable boat in colder months. It also makes overnight stays and early-season trips far more enjoyable.

How We Install A Webasto Air Top Heater On A Boat

• 1. – Choose the best heater location.
• 2. – Secure the mounting position.
• 3. – Install the fuel supply.
• 4. – Route the exhaust safely.
• 5. – Fit the air intake and ducting.
• 6. – Wire in the controls.
• 7. – Test the full system.

Step 1: Plan the heater location

The first job is choosing the best spot for the heater unit. This needs to be somewhere accessible for servicing, protected from moisture, and positioned so the warm air can reach the areas you use most.

We usually look for a location that keeps pipe runs short and reduces bends in the ducting. That helps the heater work better and keeps the installation tidy.

Step 2: Fit the mounting position

Once the location is agreed, we secure the heater to a solid mounting surface. The unit needs to be fixed firmly so it won’t move when the boat is underway.

This stage also includes making sure there is enough space around the heater for airflow, maintenance, and safe operation. Good mounting is important because it supports the whole system and reduces vibration and noise.

Step 3: Install the fuel supply

A Webasto Air Top heater usually runs from the boat’s diesel supply or from a dedicated fuel source, depending on the setup. We fit the fuel line carefully and position the fuel pump in the right place so the heater receives a steady supply.

This part of the installation needs to be done neatly and securely. The fuel line must be protected, clipped correctly, and kept away from hot or moving parts.

Step 4: Route the exhaust safely

The exhaust is one of the most important parts of the job. It carries combustion gases safely outside the boat, so it must be routed and sealed properly.

We fit the exhaust in a location that keeps fumes away from cabins, air intakes, and boarding areas. We also make sure it is installed with the correct heat protection and clearances.

NB: Exhaust gases from a Webasto heater are dangerous and must be handled with care. They can contain harmful fumes, so the exhaust system must be routed, sealed, and tested correctly to keep them safely outside the boat. For this reason, all exhaust work during a heater installation should be carried out by a qualified professional.

Step 5: Fit the air intake and ducting

The heater needs a clean air supply and a route to send warm air into the boat. We install the intake and ducting so the airflow is balanced and efficient.

This stage is where the comfort of the final installation really starts to take shape. We position outlets in the best places for even heat distribution, rather than just putting them wherever there is space.

Step 6: Wire the controls

Next, we connect the control panel and electrical supply. This allows you to switch the heater on, set the temperature, and manage the system from inside the boat.

We keep the wiring neat, secure, and easy to understand. A clear control setup makes the heater much easier to live with day to day.

Step 7: Test the system

Once everything is installed, we test the full heater system. That means checking the fuel flow, exhaust, airflow, temperature control, and overall performance.

We also look for leaks, unusual noises, and anything that could affect efficiency or safety. This final stage is where we fine-tune the installation so it performs as it should.

Step 8: Show you how it works

Before we finish, we walk you through how to use the heater properly. That includes starting it, adjusting the settings, and understanding the basics of running it well.

We also explain simple care tips, like keeping vents clear and using the heater regularly to help it stay in good condition. A little knowledge goes a long way in keeping the system reliable.

Key Benefits of A Webasto Air Top Heater

• – Warms the cabin quickly.
• – Helps reduce condensation.
• – Runs efficiently on diesel.
• – Takes up little space.
• – Makes cold-weather boating more comfortable.

Fitting A Webasto Air Top Heater – Frequently Asked Questions

Why choose JPC Direct?

At JPC Direct, we aim to make heater installation straightforward for boat owners who want a warm, comfortable cabin without the stress. We work carefully, keep things practical, and explain the job in plain English so you know what’s happening at each stage.

If you want a Webasto Air Top heater fitted to your boat, we can help you choose the right setup and install it properly for reliable use on the water.

The post Webasto Air Top Heater Installation: A Step-By-Step Guide appeared first on JPC Direct.

Whether you’re upgrading your boat’s electrical system or fitting onboard power for the very first time, understanding the marine generator installation process can help you make informed decisions and ensure your investment delivers years of reliable performance.

A properly installed marine generator provides dependable power wherever your journey takes you, allowing you to run everything from refrigeration and air conditioning to battery chargers, cooking appliances and entertainment systems, whether you’re cruising offshore, moored in a marina or enjoying life at anchor.

At JPC Direct, we supply and support some of the world’s leading marine generator brands, including Whisper Power, Fischer Panda, Paguro and Kohler. With decades of experience helping boat owners, boat builders and marine engineers choose the right onboard power solutions, we understand that every vessel has unique power requirements and installation considerations.

While the exact installation process varies depending on the size of the vessel and the generator you choose, the key stages remain much the same. In this guide, we’ll walk you through the typical boat generator installation process, explain what to consider before work begins, and highlight why professional installation is often the safest and most cost-effective option. Whether you’re researching the installation of a diesel marine generator or simply exploring your onboard power options, this guide will help you understand what’s involved before you get started.

Step 1: Choosing the Right Generator

The first step is selecting a generator that’s properly matched to your boat and your power requirements.

Think about:

• – What electrical equipment you’ll be running.
• – Whether you’ll be using several appliances at once.
• – The available installation space.
• – Noise levels and fuel type.

Quality marine generators are renowned for being compact, exceptionally quiet and highly fuel-efficient, making them a popular choice for sailing yachts, motor cruisers, narrowboats and commercial vessels alike.

If you’re unsure which model is right for your boat, we’re always happy to help you choose.

Step 2: Finding the Best Installation Location

One of the most important parts of the installation is deciding where the generator will be fitted.

The ideal location should:

• – Be dry and well protected.
• – Allow easy access for servicing.
• – Provide adequate ventilation.
• – Be close enough to fuel, electrical and cooling connections.
• – Leave enough room for routine maintenance.
• – Consider any potential noise issues.

Good planning at this stage makes future servicing much easier and helps maximise the life of your generator.

Step 3: Preparing the Mounting Area

The generator needs to be securely mounted on a strong, level surface capable of supporting its weight.

Correct mounting helps reduce vibration and ensures the generator operates smoothly, quietly and reliably.

Most current generator models are supplied with advanced sound insulation and vibration isolation systems, helping to minimise onboard noise.

Step 4: Connecting the Fuel System

The generator is then connected to the vessel’s fuel supply using marine-approved components.

This stage requires careful attention to ensure the fuel system remains safe, leak-free and compliant with marine standards.

Any fuel filters, shut-off valves and pipework should be installed according to the manufacturer’s recommendations.

Step 5: Installing the Cooling System

Marine generators require an effective cooling system to operate efficiently.

Depending on the model and the vessel, this may involve connecting to the raw water system or a heat exchanger arrangement.

Proper cooling is essential for long-term reliability and performance.

Step 6: Installing the Exhaust System

The exhaust system is carefully routed to safely remove engine gases from the vessel.

Correct installation is vital for:

• – Safety.
• – Noise reduction.
• – Preventing water entering the engine.
• – Reliable operation.

Using high-quality marine exhaust components is every bit as important as choosing the generator itself.

A gas/water separator can also be used to maximise noise reduction.

Step 7: Electrical Connections

The generator is connected to your boat’s electrical system, including battery charging, AC power distribution and any automatic changeover equipment where fitted.

This ensures power is supplied safely and efficiently throughout the vessel.

Most modern generators can also integrate with many onboard electrical management systems.

Step 8: Testing and Commissioning

Before the installation is complete, the entire system is thoroughly tested.

This includes checking:

• – Electrical output.
• – Cooling performance.
• – Fuel delivery.
• – Exhaust operation.
• – Safety systems.
• – Noise and vibration levels.

Should You Install a Marine Generator Yourself?

Although experienced DIY boat owners may be comfortable with certain aspects of the installation, fitting a marine generator involves fuel systems, electrical systems, cooling circuits and exhaust components that all need to work together safely.

Professional installation helps ensure:

• – Safe operation.
• – Reliable performance.
• – Compliance with marine standards.
• – Protection of your manufacturer’s warranty.
• – Confidence every time you leave the marina.

Why Choose JPC Direct?

At JPC Direct, we’ve been supplying marine refrigeration, air conditioning and power solutions to boat owners for many years.

As specialists in marine generators, we can help you:

• – Choose the correct generator for your vessel.
• – Supply genuine top quality equipment and accessories.
• – Advise on installation requirements.
• – Provide ongoing support and replacement parts.

Whether you’re upgrading your current power system or fitting a generator for the first time, our experienced team is here to help you every step of the way.

Need Advice?

If you’re thinking about installing a marine generator, we’d be delighted to discuss your boat, your power requirements and the best solution for your needs.

Get in touch with the team at JPC Direct today, and we’ll help you enjoy quieter, more reliable onboard power wherever your journey takes you.

Frequently Asked Questions

The post Installing a Marine Generator: Step-by-Step Guide appeared first on JPC Direct.