AGA hot water cylinders

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Domestic hot water cylinders to be used with an unpumped heat source

AGA, Rayburn, Wood Burning Stoves

How an AGA cylinder differs

An AGA (for example) may produce an 'unpumped' circuit of hot water relying on the principle of 'thermosiphoning' (hot water rising and cooler water falling) to create 'gravity circulation' within the system. A cylinder that will happily accept an unpumped heat source is subtly different from a standard cylinder in so far as the heat exchanger has a larger diameter bore (28mm) and bigger connections (to accommodate larger flow and return pipework). Connections may be spaced slightly further apart improving the thermal dynamics and therefore the flow.

Choose the correct cylinder for AGA, Rayburn and Wood burning stoves

Do not connect a cylinder designed for a fully pumped system to an unpumped system. The smaller bore pipework and heat exchanger in a cylinder suitable only for a pumped system would create a bottleneck and constrict the flow of a gravity system. The strangled flow could have significant implications for heat transfer dissipation. Please ensure you mention the heat source/s you intend to connect when ordering to ensure you get the right advice and the correct product.

A remote heat source with a Direct connection

Although unusual these days, there are systems that have a remote heat source that directly heats the water. This is to say the water in the cylinder travels to the heat source, is heated, then travels back to the cylinder. This is a traditional type of 'direct' system which requires no heat exchanger in the cylinder (only direct tappings). For this to work without contaminating the water the heat exchange process must take place in a non-ferrous heat exchanger at the boiler end. Such a heat exchanger might be ceramic or made of copper. If your cylinder requirement is for this type of system please call.

• 28mm big bore boiler coil gives better gravity flow and more efficient heat exchange

• 28mm boiler connections  facilitating larger flow and return pipework

• 22mm connections

  for cold water 'feed' and hot water 'out' (This may be altered if required)

• Tappings to suit

  You can specify position of connections if required (Sketch recommended)

• Immersion Heater side or top

  Top or side mounted immersion heater boss if and as required (please state)

• Fully Insulated

  All cylinders are supplied insulated and fully compliant with Part L.

• Please note, the thickness of insulation (*allow nominal 50mm on either side) whilst included is not stated in the dimensions. Please ensure the cylinder will fit the space you have available.

(Example: 450 stated diameter + 50mm either side (2x50) = 550mm finished diameter)

• Additional Connections

  You can customise your cylinder by adding optional features such as a dedicated 'Shower take-off' or a 'secondary return' . Please make this known before concluding your purchase.