Unvented Cylinders

Mains-pressure hot water cylinders supplied, installed and serviced by G3-qualified engineers for strong, consistent flow across taps and showers in Perth and Glasgow.

Mains-pressure hot water with safety and reliability

Correct specification delivers powerful hot water without pressure drops. Key details include storage volume, coil selection, expansion control, safe discharge routing and temperature protection. Commissioning records baseline readings and confirms settings for everyday use. Ongoing care focuses on water quality, scale management and annual servicing of safety devices so performance, compliance and warranty support remain straightforward.

Correct sizing & specification

Storage volume matched to demand, recovery times planned, and coil type selected for the heat source, preventing oversizing, shortfall and unnecessary running costs.

Safe installation & commissioning

Discharge pipework and tundish to G3, expansion vessel charged, safety set tested, blending set correctly and documentation issued for records and future servicing.

What we do

End-to-end unvented cylinder services covering specification, installation, replacement and annual servicing with documented safety checks and clear handover notes.

Accreditations

Gas Safe Registered; public liability insured with Markel Direct. G3 unvented qualified for cylinders and safety sets.

Scale control in hard water

Limescale protection fitted where beneficial to preserve flow rates, protect heat exchangers and maintain efficient cylinder recovery over time.

Blending and scald protection

Outlet temperatures limited sensibly using thermostatic blending so storage remains efficient while taps and showers stay safe and comfortable.

Boiler or heat-pump ready

Cylinder coils specified for the heat source, with recovery expectations explained clearly and controls set for reliable hot water schedules.

Upgrade to mains-pressure hot water

Arrange a survey for sizing, siting and costs with clear timelines and practical recommendations.

From survey and sizing to commissioning and handover

Check incoming mains flow and pressure, measure space and access.
Confirm storage volume, coil type and ancillary components required.
Issue a clear quote and schedule; prepare location and isolations.
Install cylinder, discharge route and expansion control; commission safely.
Test safety devices, set blending, register product and provide documentation.

Why Choose Us

G3-qualified installation focused on safety, pressure performance and longevity, with tidy layouts and documentation that makes future maintenance simple.

G3 qualified

Work completed to Building Regulations with tested safety devices and recorded results.

Proper sizing

Storage and recovery planned around occupants, bathrooms and usage patterns.

Safe discharge route

Correctly sized, falling pipework with visible tundish to protect property.

Scale management

Protection specified where needed to maintain flow and recovery performance.

Controls aligned

Hot water schedules and limits configured for reliable daily use.

Clear records

Readings, settings and guidance supplied to support future servicing and warranty.

Real outcomes in their words.

Vince Casey
Mark showed up prompt, 9am as requested, at my home complete with shower tray,screen and shower ready for action. Polite and professional ,Mark worked non stop, except when my wife insisted he have a cuppa. Despite some difficulties caused by previous bad workmanship Mark worked on, pointing out the issues and resolving them at no additional cost, and no mess,lol. Avery happy, clean family, thanks Mark. Vincent
Colin Moran
Excellent service from Mark. Highly recommend.
What is an unvented cylinder?

A sealed, mains-fed hot water cylinder delivering consistent flow to taps and showers. Safety relies on correct installation, expansion control, regulation, and annual servicing to test valves and maintain compliance.

How often should an unvented cylinder be serviced?

Annually. The service checks expansion vessel pressure, relief valves, discharge route, thermostat function, safety cut-outs and condition. Recorded readings help maintain performance, compliance and warranty between services and future visits.

What is the tundish and discharge pipework for?

The tundish provides a discharge path from safety valves. Correctly sized, falling pipework carries water safely to waste. Compliance protects property and confirms function during commissioning and annual servicing checks.

Do unvented cylinders require a G3-qualified installer?

Yes. Building Regulations require G3 competence for unvented cylinders. Qualified engineers commission, set safety controls, install discharge pipework with a visible tundish, and provide documentation and product registration where required.

What size cylinder is needed for a household?

Typical sizes run from 120 to 300 litres. Choice depends on occupants, bathrooms, usage and reheat time. A survey confirms volume, coil selection and footprint relative to the heat source and available airing cupboard space.

Heat pump or boiler compatible?

Yes. Unvented cylinders pair with boilers or heat pumps using suitable coils. Correct specification ensures compatibility, recovery performance and adequate storage, delivering reliable hot water schedules for typical household demand.