It’s Time to Move On From Gas
A Smarter, Cleaner Alternative to Gas Heating.
Pretium Synergy delivers high performance commercial air source heat pumps that replace inefficient gas boilers with next generation R290 systems — cutting running costs and carbon emissions from day one.
Our installations typically help organisations achieve 20–50%+ reductions in heating energy costs, giving estates teams, FM providers and sustainability leaders immediate savings and a clear route to Net Zero.
Powered by natural refrigerant R290 (GWP ≈ 3), our heat pumps deliver reliable high temperature output for offices, schools, healthcare sites, industrial buildings, leisure centres and mixed use estates — with outstanding efficiency, cold weather performance and future proof compliance.
We provide a complete turnkey service — from heat loss calculations and system design to installation, commissioning and lifecycle optimisation — ensuring your building transitions smoothly to a high efficiency, low carbon heating solution built for long term performance.
👉 Make your heating sustainable
Air Source Heat Pumps: Two Types — Know the Difference
(This page covers Air-to-Water heat pumps. For Air-to-Air, use the link below.)
Air Source Heat Pumps (ASHPs) come in two categories, and choosing the right one depends entirely on whether you need heating + hot water (full boiler replacement) or comfort heating/cooling (like airconditioning).
1) Air-to-Water Heat Pumps
(This Page)Air to Water ASHPs supply hot water for:
- Radiators
- Underfloor heating
- Commercial heating circuits
- Hot Water Systems (including DHW)
They are the correct choice for boiler replacement and for buildings that need a central heating and hot-water system.
2) Air-to-Air Heat Pumps
(Go to our other page)Air to Air Heat Pumps (Modern AirCons):
- Deliver warm or cool air
- Provide room by room climate control
- Do not connect to radiators or underfloor heating
- Not designed to replace your boiler
They are ideal for offices, retail, hospitality, and any building needing cooling + space heating, rather than a full wet-heating replacement.
👉Visit Air-to-Air Heat Pumps & AC PageThis entire page — including R290 technology, survey methodology, system design, installation and commissioning — refers specifically to Air-to-Water heat pumps.
| Feature | Air-to-Water Heat Pump | Air-to-Air Heat Pump |
|---|---|---|
| Primary Function | Space heating + hot water | Space heating + cooling |
| Distribution Method | Water-based system (radiators, UFH, cylinders) | Direct-to-air via indoor fan units |
| Hot Water Production | ✔ Yes | ✖ No |
| Cooling Capability | ✖ No | ✔ Yes (air-conditioning) |
| Best For | Buildings replacing boilers or needing hot water | Offices, retail, hospitality, spaces needing year-round temperature control |
| Installation Requirements | Requires pipework & water connections | Requires ductless indoor air units |
| Energy Efficiency | Very high for heating & Hot Water | Very high for heating & cooling |
| Typical Commercial Uses | Warehouses, residential blocks, training centres, schools | Offices, gyms, retail units, classrooms, server rooms |
| Ideal Replacement For | Gas/oil boilers, electric heaters | Air-conditioning units |
How We Work
1. Survey & Analysis
We also complete all safety and fire-risk considerations, ensuring the project is fully aligned with MCS survey standards from the very start.
2. System Design
The system layout, equipment selection and control strategy are all designed in accordance with MCS design standards, ensuring efficiency, consistency and compliance.
We also highlight future upgrade opportunities so your heating system can evolve as your needs change.
3. Approvals & Compliance
All documentation and calculations follow MCS compliance requirements, giving you confidence that the installation meets the recognised UK standard for low-carbon heating.
4. Professional Installation
We take great care to integrate the system cleanly with your existing heating circuit while protecting the fabric of your building. All work is carried out neatly, safely and with minimal disruption to your operations.
5. Commissioning, Optimisation & Warranty
All warranties are activated, and you receive a digital handover pack with documentation, photos, and clear operating guidance.
We also provide on-site training so your team feels confident from day one.
6. Ongoing Care
We offer remote support and fast assistance whenever needed, ensuring long-term reliability and strong performance.
Ongoing care is delivered with full awareness of MCS service and maintenance expectations, helping maintain system performance over its lifespan.
Why R290 for Heating — and Why R32 Still Shines in Cooling
Different applications demand different refrigerants — choosing correctly is key to performance and long-term efficiency.
Built for Heating
A natural refrigerant with ultra-low global warming potential (~3), R290 is engineered for high-temperature performance — making it ideal for replacing traditional gas boilers.
Its efficiency and environmental profile align with the UK’s ongoing F-Gas phasedown and long-term decarbonisation strategy.
Optimised for Cooling
R32 is a widely adopted A2L refrigerant with a GWP of 675, offering strong cooling efficiency, compact systems and mature installation standards.
It remains highly competitive for offices, retail and hospitality environments where cooling performance is critical.
R290 is the future of low-carbon commercial heating.
R32 continues to excel in cooling applications.
