

Select your heater
Choose your controller
Add your ducting and outlets via the Heater Installation Accessories tab above (or clicking here)
(Includes 90mm Outlet Hood)
Upgrade your vessel with the Webasto Air Top EVO 40—an efficient, compact and ultra-quiet marine heater designed for reliable performance in all conditions. Consuming less than 1 litre of diesel per hour at maximum output, it delivers powerful, whisper-quiet heating without relying on engine heat.
This genuine Webasto marine kit includes stainless steel components, a full wiring harness, external temperature sensor, and dosing pump noise-suppression support. It is fully certified for installation in passenger compartments and near hazardous materials.
The kit provides the essential components needed for marine installation and includes a basic electronic temperature controller. Please note: ducting and air outlets are not included. For a complete setup, browse our range of ducting, outlets and digital controllers.
Webasto Air Top EVO 40 12V air heater
Complete electrical harnesses and connections
2 metres of insulated stainless steel exhaust pipe with integrated silencer and enhanced heat shield
External temperature sensor
ISO7840-compliant fuel pipe system with dosing pump
1 x 90mm outlet hood
2 x 90mm ducting clamps
Stainless steel fuel standpipe
All required clips, screws and fittings
Comprehensive installation manual
Stainless steel heater mounting bracket
Marine hull skin fitting
Exhaust system with integrated silencer (latest design)
36-month Webasto Air Top EVO 40 warranty
We can build custom kits to suit your boat’s layout and requirements.
Please contact our sales team to discuss your installation needs.
For additional accessories, ducting or outlets, visit the heater Installation Accessories tab above. tab above or get in touch—we’re happy to help.
Warranty Terms
Mellor Solutions Ltd trading as Mellor Online is an authorised distributor of heating parts and heater kits for the vehicle and marine markets.
Warranty Coverage:
Additional Services:
Returning a Heater:
Customer Responsibilities:
Exclusions and Important Notes:
Returns Policy
Our returns policy applies to consumer purchases only (not business or trade orders).
Our returns policy does not cover items that fall under manufacturer warranties. If you believe your item is eligible for warranty service or you wish to return an item for a refund, please contact our support team or email us at sales@melloronline.co.uk.
Refunds and Cancellation Rights
You have the right to cancel your order within a 14-day cooling-off period, starting the day after you receive your items. Refund requests can be submitted within 30 days of the invoice date. Refunds will be processed within 14 days of receiving the returned goods.
Notification of Intent to Cancel
To cancel an order or request a refund under the UK Consumer Contracts Regulations 2013, you must inform Mellor Solutions Ltd trading as Mellor Online of your intention by phone, email, WhatsApp, or post within the applicable period. This is 14 days for cancellations and 30 days for refunds.
Upon receiving your request, we will send you a confirmation and authorization to return the goods. Please include your original invoice number with your return. All items must be in a resaleable condition
Upon receiving your request, we will send you a confirmation and authorization to return the goods. Please include your original invoice number with your return. All items must be in a resaleable condition.
Return Shipping
You are responsible for returning goods using an insured and trackable shipping method at your expense. We will only consider refund requests if there is proof of delivery to Mellor Solutions Ltd trading as Mellor Online from your chosen courier. Once we receive the goods, we will issue a full refund minus any delivery charges.
If you cannot arrange a return, please contact us. We can arrange collection for you, but a fee will apply, which will be deducted from your refund.
Please note that delivery charges from the original purchase are non-refundable, as the service is completed once the order is placed.
Processed and Dispatched Orders
Orders that have already been processed or dispatched cannot be canceled; however, they can be returned for a refund once received by the customer.
We strive to facilitate a prompt refund process upon receiving returned items.
Return Address
FAO: RETURNS
Mellor Online
139 Manor Road
Ossett
West Yorkshire
WF5 0LQ
United Kingdom
Specific Terms
Your Statutory Rights
Your statutory rights are unaffected by the above terms. Consumers, excluding business trade customers, are further protected under the UK Consumer Contracts Regulations 2013.
For any questions, please contact our support department before returning any items.
Shipping Information: UK & Worldwide
UK Delivery:
International Delivery:
Youtube videos are disabled until cookies are accepted.