Slimline Copper Cylinders

In addition to our extensive range of copper hot water cylinders, McDonald Water Storage offers a slimline version of any of our products for those situations where you need to minimise the space required for your hot water storage.

Depending on capacity and height available, our advanced manufacturing process can deliver hot water cylinders as small as 300mm finished diameter, the slimmest cylinders in the market.

Part of the reason we are able to manufacture to such tight diameters is down to the flexibility of copper.  This not only allows us to make such diameters easily, but also means we can put connections where you require them.  Boiler or Heat Pump Coils can also be manufactured to suit, ensuring there is enough heating surface to provide a quick recovery – something not achievable with other metals.

Compatible with renewable heat sources, our slimline range of cylinders also can come with an option of finishes: spray foam lagging or white cased.

And when it comes to quality, no compromises are made, with every Slimline cylinder manufactured to the same superior standards synonymous with the McDonald Water Storage name.

Hot Water Cylinder Size Guide

Hot Water Cylinder Shell Sizes  

Unit Dimensions

Dimensions excluding insulation 
Height x Diameter (mm)

90 Litre 120 Litre 150 Litre 180 Litre 210 Litre 250 Litre 300 Litre
300 wide
1500 2000 N/A N/A N/A N/A N/A
350 wide
1125 1500 1875 2200 N/A N/A N/A
400 wide
800 1075 1350 1620 1900 N/A  N/A
450 wide
700 900 1100 1300 1500  1800  2150

Please note:

For THERMflow combination models, you would need to add 250mm on to the height of each for the header tank

The table details shell sizes and will require insulation added which can be supplied up to 100mm thick


Our Slimline hot water cylinders are available across the range including:

To find out more, or to discuss your slimline hot water cylinder requirements, simply call our technical sales team now on 01592 611123 or contact us now.