Answer first
A credible proposal states what heat is being served, when it is needed, at what temperatures and with what resilience. It then shows how the selected system performs across the load range—not only at one peak condition.
The design also defines metering and acceptance tests. Without a post-install measurement plan, the client cannot distinguish weather, occupancy, control and equipment performance.
Annual modelling can test load and performance across the operating year
View sourceResilience strategy follows operational consequence, not habit
View sourceHeat and electricity measurements need a defined system boundary
View sourceTurn building data into a credible heat-pump design brief
Tell FLO about the building, present heat source, use pattern and project stage. The first conversation can identify the surveys, data and decision-makers needed for a credible proposal.
Create the design brief and data pack
Gather drawings, fabric, occupancy, interval energy, plant logs, temperatures, ventilation, hot water, process loads, planned changes and comfort complaints. Validate unusual spikes rather than blindly sizing to them.
Agree project goals: carbon, cost, plant replacement, cooling, capacity expansion, resilience or compliance. Different goals can lead to different systems.
Model source, sink and temperature
Assess air, ground, water and recoverable waste heat against availability, planning, drilling or abstraction, noise, maintenance and seasonal temperature.
For each heat sink, identify required flow and return temperatures and whether emitters or coils can change. Reducing unnecessary temperature lift improves the opportunity.
Design plant arrangement and controls
Select modular or single equipment, storage, pumps, headers, heat exchangers, backup, redundancy and hydraulic separation from the load profile. Check minimum turndown as carefully as peak capacity.
The sequence of operation defines staging, weather compensation, hot-water priority, defrost, backup and fault behaviour. A good schematic without a control narrative is incomplete.
Coordinate infrastructure and verification
Confirm electrical capacity, harmonic or starting considerations, network process, plant space, structure, acoustics, drainage, fire strategy, access and lifting. Plan phasing around live operations.
Specify meters, trend points, commissioning seasons, acceptance criteria and aftercare. Compare measured heat, electricity and service with the model on the same boundary.
What to read next
Related answers and services
Questions people also ask
Can annual fuel use size commercial heat pumps?+
It supports a sense check, but peak timing, temperatures, occupancy and plant operation need separate evidence.
Is one large heat pump better than several modules?+
Not universally. Turndown, redundancy, space, controls, maintenance and load profile decide.
Why specify heat meters?+
They allow delivered heat and system efficiency to be assessed against electricity on a defined boundary.
Evidence used for this answer
Figures are explained in context and links go to the independent source. Prices, tariffs, scheme rules and standards can change, so check the source again before making a financial or technical decision.
- Carbon Trust: heat pumps guide for businessesBusiness-focused guidance on heat-pump applications, system selection, financial assessment and efficient operation.
- Energy Systems Catapult: heat-pump performance analysisMeasured seasonal performance and cold-weather operation from the Electrification of Heat demonstration project.
- MCS heat-pump design standardTechnical requirements for heat loss, equipment selection, domestic hot water and system design.
- Energy Networks Association: connecting heat pumpsThe national low-carbon-technology notification and network assessment process for domestic installations.