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Warmflow Direct Unvented Stainless Steel Cylinder 210L

Warmflow Direct Unvented Stainless Steel Cylinder 210L


Direct Unvented

The electrically heated Direct cylinders are designed for instances where the use of fossil fuels is impractical / unavailable. 

Featuring two immersion heaters*, one heating the entire cylinder volume and the other heating a boost volume at the top, the cylinders are able to make use of the Economy 7 tariff in order to minimise the cost of hot water. 

If used in this way, the cylinder should be sized to provide the complete anticipated daily hot water use, thereby reducing the use of the boost element which runs on the more expensive standard tariff.

Key features

  • 1 of the top 3 performing cylinders in the UK
  • Efficient coil-in-coil design
  • Duplex Stainless Steel
  • Part L Approved
  • Seamless Welding
  • WRAS Approved
  • KIWA Approved
  • Recycled materials used in construction
  • Honeywell Diverter Valve


Good to know

Because we use a thicker layer of high quality polyurethane insulation our cylinder range has amongst the lowest fully certified heat loss levels currently on the market, saving precious fuel and reducing carbon dioxide emissions.

Our insulation is also CFC/HCFC-free, has a zero Ozone Depletion Potential (ODP) and a Global Warming Potential of only 2. Due to the large surface areas of our coil-in-coil heat exchangers it is also possible for a condensing boiler to work in condensing mode for longer, and cycle less frequently when heating the hot water, thereby helping to further reduce fuel use and emissions.


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