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900 (36") x 300 (12") 12 Gallon Single Coil Marine Calorifier (horizontal)

Price: (Inc VAT)
£343.73 (inc VAT) £286.44 (exc VAT)
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Product Description

Great value single coil 900 x 300 horizontal 12 gallon copper marine calorifier (36x12 approx inch measurement) height and diameter measurement does not take lagging into account (see below).

Included in the price of this boat cylinder is a 2 year guarantee. 

The cylinder price includes VAT and is available to ship within 2 working days.

  • Connections: half inch BSP for hot out, half inch BSP for pressure relief valve, half inch drain off, immersion boss is 2.25inch BSP, coil connections can be half inch BSP or three quarter inch BSP which can be chosen from the tick list above.
  • Double domed to cope with extra pressure. 
  • 2 Year Manufacturer Guarantee (Mannley Cylinders)
  • Price Includes VAT
  • Manufactured by boat cylinder experts Mannley Cylinders in West Yorkshire, UK.
  • Cylinder includes FlexiLag Insulation - 35mm comes as standard making the overall diameter 370mm. Thicker (50mm) lagging is available on the checklist.
  • Grade 1 thickness copper - 1.2mm thick
  • Produced under BS EN ISO 9001:2000 Quality Systems
  • 36 x 12 inches
  • Tank can hold approximately 12 gallons (54.55) litres) of water
  • Tested to a maximum of 5 bar and designed for use with PRVs set at 2.50 or 3 bar


Please note, while we operate a returns policy for standard cylinders, no return is available for an unwanted marine calorifier. In the unlikely event of a manufacturing default within the warranty period the cylinder can be replaced like for like however.

For more information you can speak to a sales advisor on 0113 871 5 871 or email sales@coppercylinder.co.uk


Please note: this cylinder is unavailable for return due to it being a rare size and shape.

Customising Your Cylinder

If you’re replacing a hot water cylinder we can make the job a little easier by creating a customised size cylinder and where the location of the connections should be. Click here to download our custom cylinder form and mark on as much information as possible. Once this is complete you can email it to sales@coppercylinder.co.uk for a quote.

At coppercylinder.co.uk we keep our prices low by manufacturing all orders received through our store rather than keeping stock of vented copper cylinders. Every cylinder is tailor-made specifically to your requirement therefore we do not accept returns of any incorrectly ordered cylinders. If there is anything you are unsure of please don't hesitate to contact us 0113 871 5 871 or sales@coppercylinder.co.uk. See terms and conditions for further info.
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Product Reviews

  1. Great value for money 5 Star Review

    Posted by on 16th Dec 2015

    Great product and great service,just what I needed

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