— Our Services
Unvented Hot Water Systems
— About This Service
Expert Unvented Hot Water Systems from A Armstrong Plumbing & Heating
Our Gas Safe-registered engineers and G3-qualified installers fit and service unvented hot water cylinders with safety and compliance front of mind. We manage cylinder selection, controls, safety valves and commissioning, and provide manufacturer-backed workmanship and paperwork for domestic and holiday-let properties.
— Our Process
How It Works
Survey & Site Check
A qualified engineer attends to assess mains water pressure, available space, and controls. We explain cylinder sizes, safety gear and expected performance.
Install & Commission
We fit the cylinder, expansion vessel and safety valves, commission controls and complete the statutory checks. All gas work is handled by Gas Safe-registered engineers where required.
Certificate & Handover
You receive compliance paperwork and operating guidance. We register manufacturer warranties on eligible installs and advise on service intervals.
— Benefits
Why Choose us for Unvented Hot Water Systems?
Safety and Compliance
Gas Safe and G3-qualified engineers handle every stage, from pressure relief valves to commissioning, giving you documented compliance and peace of mind.
Reliable High-Pressure Performance
Unvented systems deliver mains-pressure hot water to multiple outlets — ideal for family homes, larger properties and holiday lets where performance matters.
Local, Experienced Team
A family-run business with 20+ years' experience around New Milton and the south Hampshire coast, offering tidy work, clear communication and manufacturer-backed guarantees.
What we install and service
We fit unvented hot water cylinders, expansion vessels, safety and pressure controls, immersion heaters and the associated safety gear required by current regulations. Installations are carried out by our Gas Safe-registered and G3-qualified engineers with manufacturer-accredited standards that allow extended warranties where eligible.
Why choose an unvented system?
Unvented cylinders provide mains-pressure hot water to multiple taps without the need for header tanks. That makes them an excellent choice for modern houses, converted barns and holiday lets in New Milton, Christchurch and Lymington. We also offer routine servicing and rapid repairs to keep systems safe, efficient and compliant.
— FAQ
Frequently Asked Questions
Unvented cylinders store hot water at mains pressure, delivering stronger flow to showers and taps. Vented systems use a cold-water header tank and operate at lower pressure. Choice depends on mains supply, space and the number of outlets you need.
— Related Services
Other Services We Offer
Book a site survey for an unvented system
— Other Services