Commercial · Plant Rooms · Gas Safe Commercial
Design, install and commission of commercial plant rooms, cascade boilers, low-loss headers, plate heat exchangers and full BS 6644 gas commissioning, including pre-commission tightness testing and certified purging.
Gas Safe commercial · BS 6644 / IGEM compliant · Single point of accountability
Service overview
Plain-English breakdown, so you know exactly what you're paying for, and why it matters before we set foot on site.
Full commercial plant room work, from initial heat-load survey and design, through installation of cascade boilers, low-loss headers, shunt pumps, pressurisation units, plate heat exchangers and BMS controls, to final BS 6644 commissioning and certified purging of the new gas supply.
Facilities managers, M&E consultants, schools, care homes, churches, gyms, offices and light industrial sites needing a new plant room, a like-for-like cascade swap, or a major plant overhaul with minimal downtime.
End-of-life atmospheric boilers, repeat lockouts on existing cascades, planned refurbishments, energy efficiency upgrades, sites moving from oil/LPG to natural gas, or any project requiring an updated commissioning record for insurance or planned maintenance.
Commercial plant rooms are the single biggest energy spend on most sites. A correctly designed cascade with weather compensation and proper hydraulic separation typically cuts gas consumption 20–35% versus a legacy atmospheric setup, and a properly purged, certified gas install is the only one a competent insurer will sign off.
The cost of doing nothing
Plant room work is unforgiving. A skipped step on commissioning or purging doesn't reveal itself until something fails, usually at the worst possible time.
Our process
Same system every time. No improvising on your floor.
We measure existing plant, ventilation, flue runs, gas supply capacity and run a full heat-loss calculation against actual occupancy and use patterns.
Schematic drawings, equipment schedule, commissioning method statement and a fixed written quote. No 'subject to site' caveats once we've surveyed.
Old plant decommissioned, gas isolated, new cascade boilers, low-loss header, pressurisation unit, plate heat exchangers and pumps installed to schematic.
Full IGEM/UP/1 tightness test on the new gas install, certified purge volumes calculated and logged, gas readings and let-by tests documented.
Combustion analysis on every burner, weather comp and load matching set, BMS integration verified, O&M manuals and commissioning certificates handed over.
What you get
Correctly designed cascades with weather compensation outperform legacy atmospheric plant by a wide margin from day one.
One Gas Safe commercial engineer owns the project from survey to commissioning. No subcontract chains.
BS 6644 commissioning, IGEM/UP/1 tightness and purge certificates, gas notifications lodged with Gas Safe.
Most cascade swaps are phased so the site has heat and hot water throughout the swap. Out-of-hours work available.
Hydrogen-blend ready burners, BMS-friendly controls, room left in the plant room for future load growth.
Up to 10 years on Remeha, ATAG and Hamworthy cascade models, backed by Heatrite's workmanship guarantee.
In depth
The details a salesperson skips. Skim it, or read every word, both are useful.
A single 500kW atmospheric boiler short-cycles all summer when the load drops to 60kW. A cascade of 4 × 150kW modulating condensing boilers fires only what the load demands, modulates down to 15% on each unit, and uses condensing latent heat recovery on the cool returns. The result, on a typical school or care home, is a 25–35% drop in gas use and a near-elimination of short-cycle lockouts.
Modern cascades need hydraulic separation, the boiler primary circuit runs at its own flow rate, the building secondary circuits run at theirs. A correctly sized low-loss header (or plate heat exchanger) decouples them, lets each pump do its job, and stops one heating zone starving another. Skipping this is the most common mistake on retrofit cascade installs.
New steel pipework arrives full of mill scale, flux and oil residue. Firing a new £20k cascade onto an unflushed system loads its heat exchangers with debris on day one. We pressure-test, chemically clean and power flush every new install (or new section), and dose to BSRIA BG 29 standards before handover.
Every new or modified commercial gas install is tightness tested to IGEM/UP/1 (or UP/1B for medium pressure), with let-by checks, strength test where applicable, and purge volumes calculated against pipe internal volume. You get a signed, dated certificate, photographed gauge readings, and the figures lodged with our records for 7 years.
Plant kit without controls is half a system. We commission weather compensation curves against the actual building fabric, integrate the cascade with BMS (Trend, Honeywell, Cylon) via 0–10V or Modbus, and tune load-matching so the smallest possible boiler quantity fires for the actual demand. Most clients see another 8–12% gas saving from controls tuning alone, on top of the new plant.
General work gallery
A broader look at recent installs, hot water systems, testing work and finished jobs across domestic and commercial sites.
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Installed and commissioned by Heatrite.
Commercial heating
Installed and commissioned by Heatrite.
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Installed and commissioned by Heatrite.
Oil heating
Installed and commissioned by Heatrite.
Unvented cylinders
Installed and commissioned by Heatrite.
Hot water systems
Installed and commissioned by Heatrite.
Boiler installation
Installed and commissioned by Heatrite.
Gas testing
Installed and commissioned by Heatrite.
Bathroom installation
Installed and commissioned by Heatrite.
Unvented cylinders
Installed and commissioned by Heatrite.
Bathroom installation
Installed and commissioned by Heatrite.
Boiler installation
Installed and commissioned by Heatrite.
Commercial heating
Installed and commissioned by Heatrite.
Boiler installation
Installed and commissioned by Heatrite.
Commercial heating
Installed and commissioned by Heatrite.
Boiler installation
Installed and commissioned by Heatrite.
Hot water systems
Installed and commissioned by Heatrite.
Hot water systems
Installed and commissioned by Heatrite.
Oil heating
Installed and commissioned by Heatrite.
Unvented cylinders
Installed and commissioned by Heatrite.
Boiler installation
Installed and commissioned by Heatrite.
Unvented cylinders
Installed and commissioned by Heatrite.
Commercial heating
Installed and commissioned by Heatrite.
Commercial heating
Installed and commissioned by Heatrite.
Hot water systems
Installed and commissioned by Heatrite.
Commercial heating
Installed and commissioned by Heatrite.
Frequently asked
Can't see your question? Call 07584 076105 or 07702 523464.
We're fully commercial Gas Safe registered for cascades up to ~1 MW, with experience on Remeha Gas, ATAG, Hamworthy and Ideal Commercial. Larger jobs handled in partnership with specialist consultants on the design side.
Payment & finance
Boilers, bathrooms and larger installs can be spread over time with Klarna or Clearpay finance, just ask when you book.
We carry a card machine in the van, tap, chip & PIN or contactless on completion.
Spread the cost of your boiler or bathroom install with flexible Klarna finance options.
Pay over time with Clearpay, ideal for boilers, cylinders and full bathroom fits.
Ready when you are
Written fixed quote. Gas Safe engineer. No upsell, no pressure.
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