West Sussex · RH12, RH13
Cylinder & Pump (G3) in Horsham
Cylinder, pump and unvented hot water system work covers installing or replacing a hot water storage cylinder, fitting a pump to boost pressure to showers or taps, and — where the system is unvented, meaning it's fed directly from the mains rather than a header tank — carrying out the installation and any subsequent work under G3 unvented hot water qualification, which is a legal requirement under the Building Regulations.
In Horsham, that covers Roffey, Holbrook, Littlehaven, Denne, Trafalgar, Broadbridge Heath, Southwater, Warnham, Colgate. Horsham's town centre retains a historic core of timber-framed and Georgian buildings around the Carfax and Causeway, surrounded by Victorian villas, interwar suburbs and newer developments on the town's edges. The surrounding villages and countryside sit close to the South Downs, which shapes both the property styles and the planning context for extension and renovation work.
Coverage
Areas we cover in Horsham for cylinder & pump (g3)
Property styles in Horsham
Horsham has a strong stock of period cottages and Victorian villas in and around the town centre, alongside 20th-century family housing in the surrounding estates and larger detached homes in the outlying villages. Extension and loft conversion potential varies significantly between the historic core and the more recent suburbs.
Planning considerations
Horsham District Council is the local planning authority. The town centre, including the Causeway, is a conservation area with a number of listed buildings, meaning alterations to visible elevations, windows and materials are more tightly controlled. Some outlying villages also have their own conservation area designations, which we check before advising on likely planning routes.
How it works
Our cylinder & pump (g3) process
- 01
Assessment
Reviewing the existing hot water system, incoming mains pressure and flow rate, and what the household needs from it.
- 02
Specification
Agreeing cylinder size and type, and whether a pump is needed to meet pressure requirements.
- 03
Installation
Fitting the new cylinder or pump, including the safety fittings a G3 installation requires — expansion vessel, pressure and temperature relief valves, and tundish.
- 04
Commissioning and certification
Testing the system and issuing the relevant Building Regulations notification and commissioning certificate for unvented installations.
Also in this area
Other services we provide in Horsham
Nearby coverage
Cylinder & Pump (G3) in nearby areas
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FAQs
Cylinder & Pump (G3) in Horsham: FAQs
Do you provide cylinder & pump (g3) across all of Horsham?
Yes, we cover the RH12 and RH13 postcode areas in full, including Roffey, Holbrook, Littlehaven, Denne, Trafalgar, Broadbridge Heath, Southwater, Warnham, Colgate.
What does G3 qualified mean and why does it matter?
G3 is the recognised qualification for working on unvented hot water systems, required under Building Regulations Part G because these systems store pressurised hot water and can fail dangerously if the safety devices aren't correctly installed or maintained. Always check an engineer's G3 qualification before unvented cylinder work is carried out.
Does an unvented cylinder need annual servicing?
Yes, and it's usually a condition of the manufacturer's warranty as well as good practice — the safety valves need checking annually by a G3-qualified engineer to confirm they're operating correctly.
Is Horsham town centre a conservation area?
Yes, the historic core around the Carfax and Causeway is a conservation area with a number of listed buildings, which affects what changes can be made without planning permission or listed building consent.
Get a quote for cylinder & pump (g3) in Horsham
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Last reviewed 2026-07-28.