Step 1: Heat Loss Survey
Before any work begins, an MCS-accredited installer will conduct a detailed heat loss survey of your property. This involves measuring every room, checking insulation levels, and calculating the total heat demand of your home. This survey determines the correct size of heat pump for your property — a crucial step to ensure efficiency and comfort.
Step 2: System Design & Quote
Using the heat loss survey results, the installer designs your new heating system. This includes selecting the appropriate heat pump unit, determining whether your existing radiators need upgrading, specifying a hot water cylinder if required, and calculating expected running costs. You receive a detailed written quote.
Step 3: Applying for the BUS Grant
If you're eligible for the Boiler Upgrade Scheme, your MCS-accredited installer handles the grant application on your behalf. This is done before work begins.
Step 4: Installation Day(s)
Most residential ASHP installations are completed in 1–2 days:
- Morning Day 1: Outdoor unit positioned and mounted on a slab or wall bracket. Refrigerant pipework run to indoor location.
- Afternoon Day 1: Indoor unit/hydrobox installed. Pipework connected to heating system and hot water cylinder.
- Day 2 (if needed): Radiator upgrades, electrical work, controller installation.
Step 5: Commissioning
Commissioning is the process of setting up and testing the system. The engineer checks refrigerant pressures, sets flow temperatures, programs the controller, and runs the system through a full heating cycle. An MCS Commissioning Checklist is completed.
Step 6: Handover
You receive a full system handover, including operation training, the commissioning certificate (needed for your BUS grant and warranty), and warranty documentation. The installer also registers your system with the MCS database.
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