Upgrade to powerful, mains-pressure hot water across every tap and shower in your home. Expert G3-certified installations and annual safety servicing.
If someone turns on a kitchen tap or runs the washing machine while you are in the shower, and your water pressure suddenly drops to a trickle, your home is likely running on an old-fashioned vented hot water system. Vented systems rely on a cold water storage tank in your loft to gravity-feed water down to the cylinder, which limits your shower pressure to a weak gravity flow.
A modern unvented hot water cylinder eliminates the need for a loft tank entirely. By connecting directly to your incoming water mains supply, it stores water under high pressure. This system ensures you can run multiple high-pressure showers, taps, and baths at the exact same time across multi-story or multi-bathroom properties with zero drops in flow rate or temperature.
Compare why a modern unvented cylinder system is the superior choice for home plumbing improvements.
Traditional Vented: Gravity-fed from a cold water tank in your loft.
Modern Unvented: Fed directly from your high-pressure incoming water mains.
Traditional Vented: Low pressure, unless noisy and expensive booster pumps are fitted.
Modern Unvented: Strong, luxury multi-outlet rain shower performance naturally.
Traditional Vented: Occupies valuable floor space in your loft with cold water storage tanks.
Modern Unvented: Frees up your entire loft area for potential conversions or extra storage.
Traditional Vented: High risk of frozen or burst pipes in uninsulated cold loft spaces.
Modern Unvented: Zero loft pipework needed; the system is entirely insulated within the home.
Because unvented hot water cylinders store highly pressurized, scalding water, they are classified under Section G3 of the UK Building Regulations. Due to the high pressure, it is illegal for an uncertified plumber to install, commission, or service these units.
I hold full G3 certification. This ensures I install your cylinder safely, install the necessary expansion vessels and Temperature & Pressure Relief Valves (TPRV), register your system directly with local building control, and issue your legal compliance certificate upon completion.
Keep your unvented cylinder safe, efficient, and compliant.
Just like a boiler, your unvented hot water cylinder requires an annual checkup. This checkup ensures that safety valves haven't seized, the internal expansion air bubble is re-charged, and your 25-year structural manufacturer warranty remains active.
Clear, upfront costing for routine checks of your cylinder's safety mechanisms.
I install and service unvented hot water cylinders in homes across all Basingstoke local neighborhoods. As a G3-certified installer, I ensure your system is completely safe and building regulations compliant.
I regularly visit properties and carry out installations and maintenance across Hatch Warren, Beggarwood, Chineham, Lychpit, Old Basing, Kempshott, Oakley, Brighton Hill, and Sherborne St John.
Answers regarding G3 compliance, requirements, and system setup.
Book a G3-qualified engineer to survey your home or schedule your annual safety check.
A Clarke Plumbing & Heating LTD has served domestic and commercial clients for over three decades. Talk to me now to arrange an inspection!
Professional support for domestic and light industrial systems. Boiler installs, heating tune-ups, custom pipings, and fast fixes.
© 2026 A Clarke Plumbing & Heating LTD. All rights reserved.
Registered in England and Wales. Company number 17055246.
Registered office address: 117 Porter Road, Basingstoke, England, RG22 4JT.
Brand plumbing and gas services marketed under Gas Safe registration.
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