

High-performance heating for commercial, marine and specialist applications
The Webasto Thermo Pro 90 is a powerful, robust 9kW water heater designed for heavy commercial vehicles, specialist builds, minibuses, motorhomes, RVs and marine installations.
This model includes advanced features such as:
Automatic high-altitude adjustment up to 3,500m (Special Edition model 24v only: 9034839A)
Arctic Start technology for reliable operation in extreme cold
Smooth, efficient heating control with reduced energy consumption
Low operating noise for added comfort
Built for demanding environments, the Thermo Pro 90 delivers fast warm-up times, outstanding reliability and long service life. It is suitable for both new installations and retrofits.
Engine-independent heating for heavy commercial vehicles and marine systems
Up to 9.1kW of heating output
Exceptional cold-weather performance thanks to Arctic Start
Low power consumption, helping reduce running costs
Durable, high-quality construction backed by Webasto
Automatic altitude compensation up to 3,500m for consistent performance in mountains and high-elevation areas
36-month genuine Webasto warranty
Webasto Thermo Pro 90 9kW Water Heater (9034839A High-Altitude Edition)
Water Pump
Controller (select from the drop-down above)
Water connector pipe (for engine pre-heat)
Stainless steel exhaust system with silencer and fixings
Full wiring harness and connectors
Combustion air intake pipe
Exhaust silencer
Fuel dosing pump
Water pump
Fuel supply pipe & plastic fittings
Mounting bracket
Everything included for a professional-grade installation.
Small vans and minibuses
VW T5 / camper conversions
Caravans & mobile homes
Campervans & motorhomes
Horseboxes
4x4 vehicles
Marine installations
Replacement heater systems
We can build bespoke kits to suit your vehicle or marine requirements.
Contact our sales team for tailored solutions.
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:
9024621A
9023075A
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