Hot Water and Heating Upgrade at the Phoenix Centre, Norwich

Step 1: Investigating the Lukewarm Water

Our initial focus was inspecting the centre’s existing hot-water cylinder. The appliance was aging and showed clear signs of long-term wear due to operating without adequate scale protection.

Electrical testing confirmed that one of its two heating elements had completely failed, leaving the cylinder running at only half its intended capacity. This explained why the water remained lukewarm and why the system struggled whenever demand peaked in the kitchen and public washrooms. Given the age and overall condition of the equipment, replacing the cylinder outright offered far better long-term value than a temporary repair.

Installing the New Joule Cylinder

To restore a dependable hot-water supply, we installed a 200-litre Joule direct hot-water cylinder fitted with twin heating elements. This new unit directly serves the washbasins in the public toilets and the kitchen facilities used for community food preparation.

During the two-day installation:

• Associated pipework was re-routed where necessary and thoroughly insulated to eliminate heat loss.

• A cold-water conditioner was fitted on the incoming mains supply, protecting the new cylinder and connected equipment against limescale.

Pleased with the quick turnaround and quality of work, the client invited Allstar Systems to assess the centre’s wider heating plant.

Step 2: Uncovering Plant-Room Safety & Heating Issues

The client noted that the Phoenix Centre had struggled to heat properly for several years, leaving key areas cold and uncomfortable during winter.

Our detailed inspection of the plant room revealed significant operational problems and a critical safety hazard: products of combustion were actively spilling from the existing Keston boiler.

Because of the immediate risk of harmful gas exposure, the appliance was classified as Immediately Dangerous and isolated with the client’s full consent. Rather than replacing the failed appliance with a single large unit, Allstar Systems engineered a resilient, twin-boiler cascade system tailored for commercial demand.

Step 3: Engineering a High-Performance Heating System

1. Resilient Twin-Boiler Cascade Array

We installed two Worcester Bosch Greenstar 8000 Life 30 kW system boilers, providing a total combined output of 60 kW. The cascade setup offers two key operational benefits:

• Energy Efficiency: The system modulates automatically to match demand, firing one or both boilers as needed.

• Built-in Redundancy: If one unit requires servicing or experiences a fault, the second boiler continues supplying partial heat so the building can remain open.

2. Improved Hydraulics & Zoned Heating

To ensure smooth heat distribution across all 28 radiators:

• A SpiroCross low-loss header was installed to provide hydraulic separation between the boiler loop and the distribution pipework.

• A Grundfos MAGNA twin-head pump was fitted to maintain optimal circulation while adding pump redundancy.

• The building was divided into two distinct heating zones, allowing staff to heat active areas without wasting energy on unused rooms.

3. Power Flushing & System Conversion

Before commissioning the new boilers, the entire system underwent a thorough power flush to remove built-up sludge and iron oxide from the pipework and 28 radiators. We then fitted two magnetic system filters to capture residual debris and protect the new heat exchangers.

Finally, the heating installation was converted to a sealed system. We installed an 80-litre Flamco Premium expansion vessel alongside a Flamco automatic pressurisation unit, eliminating manual filling and maintaining optimal system pressure.

4. Modern Gas-Safety Interlocks

To bring the plant room up to modern commercial safety standards, we integrated a full safety control panel featuring:

• An automatic gas solenoid valve

• Interlocked carbon monoxide and heat detectors

• An emergency gas shut-off button for manual isolation

• Automatic gas isolation if an unsafe condition is detected

Results & Community Impact

The complete heating transformation was finished in approximately two weeks. Following flushing, filling, and final commissioning, heat circulated evenly across all 28 radiators.

The Phoenix Centre now benefits from:

• Reliable, hot water for kitchen and washroom facilities.

• A 60 kW cascade heating system with built-in operational backup.

• Two independently controlled heating zones for lower energy bills.

• A power-flushed pipework network protected by dual magnetic filters.

• Automated pressure maintenance and modern gas-safety controls.

• A warm, welcoming environment for local community activities.

Commercial Heating Support in Norwich & Norfolk

Allstar Systems provides commercial boiler installation, hot-water cylinder replacement, plant-room upgrades, and routine maintenance across Norwich and Norfolk. Whether managing a local community venue, school, or commercial property, our qualified engineers deliver safe, efficient heating solutions.

Need a commercial heating assessment?

Contact our team on 01603 523247 or email [email protected].