Vented vs unvented cylinders — which is better for a London home?
Unvented cylinders give mains-pressure hot water at every outlet with no loft tank required — the preferred choice for most prime London properties.
Vented vs Unvented Cylinders
Vented cylinders rely on a cold water header tank in the loft, feeding the cylinder by gravity. Pressure is often weak, especially on upper floors or in properties without loft space.
Unvented cylinders (like Megaflo, OSO and Telford) connect directly to the mains, delivering strong, consistent pressure at every tap and shower — with no loft tank required.
Why Unvented Suits London Homes
- No loft tank needed — ideal for period conversions and apartments without loft access
- Strong simultaneous pressure across multiple bathrooms
- More flexible cylinder positioning (airing cupboard, utility room, plant room)
The trade-off is that unvented systems require annual G3 servicing by a qualified engineer, which RARE provides as part of our Membership plans.
Reviewed by RARE Plumbing London Engineering Team — Gas Safe registered engineers serving prime London since 2013.
Related Service
Hot Water Cylinder Installation
Expert engineers across prime London