Eberspacher Hydronic D5WSC heater to Hydronic S3 D5E 12V Upgrade Kit inc EasyStart PRO Timer

Part Number: 252993050007
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Eberspacher Espar Hydronic S3 12v 5kW Water Heater Changeover Kit

For upgrading the Hydronic D4WSC and D5WSC on a 12v Marine or Vehicle application.


252219050000 - Hydronic D5WSC 12v
252257050000 - Hydronic D4WSC 12v

  • Genuine Guaranteed Eberspacher HS3 D5E 5.0kW water heater with water pump & fuel pump
  • Automatic altitude adjustment up to 3000m with the Easy Start PRO controller
  • 7-Day programmable timer with on-board fault code readout for easy diagnostics
  • Diesel fired water heater with 5 kW heating power
  • For cabin interior saloon heating and Engine pre-heating
  • Also Domestic Hot water if coupled with a plate heat exchanger, hydroplate or calorifier

Heater upgrade kit includes;

  • Eberspacher Espar Hydronic S3 D5E CS (most desirable version)
  • Water pump and fuel pump
  • Easy Start Pro Controller with 7-day timing and altitude switching
  • Heater wiring harness and electrical accessories
  • Mounting bracket and fixing bolts

Please note - this heater 'upgrade kit' includes necessary items to upgrade your heater from the previous models of Hydronic D4WSC D5WSC heater versions. This package does not include exhaust pipe, silencer, standpipe, fuel line or coolant hose.

New Features Include;

  • Stepless heating performance control.
    This allows for a more dynamic heat output, that modulates from 1.3kW up to 5kW depending on requirement. Making the HS3 more fuel efficient than previous Hydronic models.
  • More Power for Size.
    Retaining the usual Hydronic 5 power output the Hydronic S3 still has 5kW of heating to hand although its dimensions are smaller at 215 x 91 x 144 mm.
  • Noise levels optimised.
    The new HS3 Vehicle Kit also includes the new, almost silent Eberspacher digital fuel dosing pump. No more “ticking” sounds! Not only have Eberspacher developed a silent running fuel pump, the Hydronic S3 also includes a newly developed vehicle exhaust silencer and combustion air silencer to quieten down the exhaust and combustion air noise.
  • Low maintenance.
    The Hydronic S3 Economy has a service life of 3000 hours. That’s just over 8 hours a day for 365 days of the year!
  • OBD On-board diagnostics.
    Fault display via the Easy Start PRO. The Hydronic S3 coupled with an Easy Start PRO will give a text-based fault description, reducing confusion and saving time diagnosing the issue.
  • Automatic Altitude Adjustment
    Altitude adjustment will be automatically handled by the HS3 up to 1500m above sea level; altitude adjustment can be activated manually above 1500m with the EasyStart PRO (see images)


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Please Note: Delivery prices quoted are excluding VAT.

Deliveries are made from Monday to Friday excluding Bank and National Holidays.

Next Working Day Shipping* is available in UK Mainland for all orders placed before 15:00hrs. Orders placed after 15:00hrs will be dispatched the following working day on a next day service.

Orders placed on a Saturday or Sunday will be despatched the following Monday (except Bank Holidays) for expected delivery following business day (Tuesday).

For Next Business Day Delivery, please select Next Day.

Standard 2-day shipping* is available to Scottish Highlands and Islands orders placed before 15:00hrs on stocked items. Items are despatched promptly sameday. UK Courier services are typically 2 day delivery for remote UK postcodes.

WEEKEND deliveries in the UK may be possible if required at additional cost. For WEEKEND delivery quotation please call our Sales Team prior*

Standard carriage / Free-shipping - please allow 2-5 working days from clearance of payment for delivery. Typically however delivery is much quicker and 98% of orders are delivered to UK addresses within 24 - 48 hours after dispatch from warehouse.

Delivery Times - Deliveries are made Monday to Friday (excl. public holidays) typically 2-5 working days from date of order for in-stock items if the FREE DELIVERY option is chosen. An email will be sent to inform you of dispatch of goods and due delivery date. Next Day UK delivery may be selected at checkout for an additional cost.

  • Free worldwide delivery will not be available if one of the following is applicable to your order:
  • Your order has a total weight exceeding 18kgs
  • You already have a discount code applied to your order
  • Your basket contains a special order item that requires shipping additionally.

Our returns policy does not include manufacturer warrantable items. Please speak to our support department or email sales@butlertechnik.com if you believe your item has failed within warrantable circumstances, or if you wish to return an item for refund.

Refunds and Right to Cancel

You have the right to cancel your order within a 14 (fourteen) day "cooling off period", which starts the day after you receive your items. You can apply for a refund within 30 (thirty) days from the date of invoice.

Prior Notification of Intent

If you wish to cancel an order or submit a refund request under the UK Consumer Protections (Distance Selling) Regulations 2000, you must inform ButlerBus Technik Ltd of your intention to cancel or return your order by either phone, email or post within the 14 (fourteen) day cooling off period for order cancellation, or 30 (thirty) day period for refunds.

When Butlerbus Technik has received your request you will receive confirmation and given authorisation to return goods. Please quote and include your original invoice number. All goods must be in a re-saleable condition.

You will be required to return goods at your cost by an insured and trackable method. If goods go missing we will only consider a request for refund on proof of completed receipt/delivery of goods to Butler Technik from your nominated courier. Once we have received goods we will then issue you a full refund less any delivery charges.

If you are unable to arrange a return please contact us. We can arrange collection on your behalf but a charge will be made which will be deducted from your refund total.

If a delivery charge was made on the original purchase this will not be refunded as this is a service which is concluded at the point of order.

Orders that have already been processed and/or dispatched cannot be cancelled; they must be returned to ButlerBus Technik Ltd for refund following receipt of goods by customer.

We will do our very best to assist and enable a quick refund process upon receipt of returned items.

Thank you for your continued understanding during this process

Returns address
ButlerBus Technik Ltd
Bridge Road
United Kingdom

    Specific Terms:
  • All costs relating to return shipping of correctly supplied goods shall be the responsibility of the purchaser.
  • ButlerBus Technik Ltd are not responsible for any shipping or insurance charges relating to return of goods.
  • Please be aware that ButlerBus Technik Ltd may NOT be able to accept for full or partial refund/credit any items that have been prior installed by the customer before return. Such goods/components shall be deemed 'used' and therefore unable for subsequent resale.
  • Specifically, but not exclusively, the return of prior installed electronic items used for purchaser diagnostic or trouble-shooting purposes shall not be considered for full refund.
  • The decision to refund or partially refund prior installed items shall remain solely at the discretion of ButlerBus Technik Ltd.
  • The decision to refund or partially refund goods returned beyond 30 days after original date of sale shall remain solely at the discretion of ButlerBus Technik Ltd.

Your statutory rights are unaffected by the above. Consumers other than Business trade customers are further protected by UK Consumer Protection (Distance Selling) Regulations 2000.

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Eberspacher Hydronic D5WSC heater to Hydronic S3 D5E 12V Upgrade Kit inc EasyStart PRO Timer

£995.00 (ex. VAT)