home > plumbing > hot and cold water systems >

Unvented cylinders

Unvented cylinders all operate on the principle of your cold water main providing the pressure directly to the hot taps, via the cylinder. They are all equipped with safety devices and generally require a large water main coming into the property if they are to feed more than one bathroom. Trapped air allows the hot water to expand and does away with the cold water tank in the roofspace. This makes them very useful to free up space when undertaking loft conversions.

All makes are available with twin coils for solar heating. We offer three brands which each have their own advantages although the actual hot water performance (pressure and flow) is virtually identical across all makes (they are all in principle just an empty storage container).

ultrasteel

Albion Ultrasteel
Our budget cylinder. Fitted with an external expansion vessel, this does not need periodic recharging.

Heatrae Sadia Megaflow
The Megaflow cylinder with internal expansion vessel. The best known brand on the market which does not require the additional vessel fixed to the wall but uses an internal baffle instead. These require periodic recharging to maintain the air bubble inside.
 

Vaillant Unistor
The Unistor is a very good solution when installed with a Vaillant boiler and intelligent controls to provide a complete Vaillant system solution.

ACV Smartline

ACV Smartline
An innovative Tank-in Tank cylinder from Belgium. This very high efficiency cylinder offers greater limescale resistance than conventional coil cylinders.
 
© Mattingly 2011