Unvented Hot Water Cylinder Installations | Hertfordshire & North London
Powerful, consistent hot water — built for modern homes.
We design and install unvented hot water cylinder systems that deliver exceptional performance across multi-bathroom properties.
Fully G3 certified. Trusted by architects, developers & homeowners across Hertfordshire & North London.
No One Wants a Luxury Bathroom With Poor Hot Water
We see it all the time:
👉 Beautiful bathrooms that can’t run multiple showers properly.
👉 Kitchens with boiling taps but poor hot water flow.
👉 Homes where hot water runs out too quickly — frustrating the whole family.
The problem:
In many premium homes, the hot water system isn’t properly designed for modern demand.
Off-the-shelf cylinders, undersized installs and poor commissioning are all too common — especially when unqualified installers fit the system.
WHAT CLIENTS HAVE TRIED (AND REGRET)
👉 Fitting an oversized combi boiler → but still running out of hot water.
👉 Installing a cylinder without checking flow rates or demand → great brand, wrong spec → poor performance.
👉 Choosing a cheaper cylinder → but paying later in energy bills, slow recovery and poor reliability.
👉 Using a general plumber → but no G3 certification → dangerous and non-compliant install.
👉 Adding bathrooms → but not upgrading hot water system → pressure & flow suffer across the home.
THE DREAM OUTCOME
✅ Powerful, consistent hot water at all outlets → even with multiple showers running.
✅ Fast recovery time → cylinder re-heats quickly → ready for the next use.
✅ Properly balanced pressure → no mixer tap issues → perfect temperature control.
✅ Whisper-quiet operation → no banging, gurgling or flow noise.
✅ Efficient, energy-saving system → modern cylinders save money compared to older systems.
✅ Fully compliant, safe and future-proof → installed by G3 certified specialists.
At Sable Projects, we design and install high-performance unvented hot water cylinder systems:
✔️Megaflo
market leader for premium performance
✔️ Gledhill
high-efficiency cylinders with excellent recovery
✔️Heatrae Sadia
trusted and proven in high-end homes
✔️Joule
smart cylinders with heat pump compatibility
✔️Telford & Kingspan Albion
flexible options for bespoke requirements
✔️Full system design
matched to property size, usage and flow demand
✔️System sizing
no more running out of hot water
✔️ Pressure & flow balancing
across all hot and cold outlets
✔️Full G3 compliant installation
with Building Control sign-off
Full Integration with:
✅ Water booster systems
✅ Heat pumps
✅ UFH and multi-zone heating
✅ Cylinders with solar coil / renewable integration
Full commissioning → ready to perform from day one
WHO WE WORK WITH
We install advanced water booster systems for:
High-end homeowners
→ frustrated by poor hot water performance
Architects
→ specifying premium plumbing systems
designers
→ specifying premium plumbing systems
Developers
→ building multi-bathroom properties → need reliable hot water systems
Builders & project managers
→ trusted hot water partners → G3 certified
Renovators
→ upgrading older cylinder systems → improving performance & efficiency
WHY CHOOSE SABLE PROJECTS
We are specialists
we are not just “boiler fitters” → we understand complete hot water system design.
We specify the right cylinder
not just the brand your plumber prefers.
We integrate cylinders properly
with boosters, heating, renewables → balanced, efficient systems.
We are G3 certified
all installs fully compliant with Building Regulations and manufacturer standards.
We deliver professional, clean installs
fit for high-end homes.
We protect your project
performance tested, future-proof and fully signed off.
Plumbing Refurbishment FAQs
What size cylinder do I need?
It depends on the number of bathrooms, outlets and lifestyle → we specify the perfect size for your home.
Will an unvented cylinder improve water pressure?
It can → when integrated with the right booster system and balanced properly.
Do I need G3 certification to install a cylinder?
YES → and too many installers ignore this → Sable Projects is fully G3 certified → safety first.
Can you replace my existing vented cylinder?
Yes → we design replacement systems to upgrade older setups and improve performance.
Will the cylinder be noisy?
Not when designed and installed properly → we ensure quiet operation as standard
Let’s Upgrade Your Hot Water System — The Right Way.
If you want a hot water system that performs perfectly — and a cylinder that delivers reliable flow to every bathroom — we’d love to help.
We specialise in designing and installing G3 certified unvented hot water systems → for homes where quality matters.
Talk to us today → and experience the difference.
Manufactures
Email: [email protected]
Phone: 020 7078 9415
Address Office: 2a Highland Drive, Hemel Hempstead HP3 8PT