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Heat-pump sizing and heat-demand assessment — Heat-pump installer
Supply plans, insulation information and details of the existing emitters and hot-water use. Explain whether you need preliminary feasibility or a design suitable for installation so the assessor can identify what must be measured and what conclusions the available evidence can support.
Service scope
Professional assessment of building heating and hot-water requirements to inform heat-pump and associated-system selection. Sizing must state the building evidence, design conditions and emitter assumptions; a rough area-based estimate is not equivalent to a complete room or system design.
What is normally included
- Building and demand-data assessment
- Heat-pump sizing recommendations
- Documented assumptions and design limitations
What is not included
- Equipment selection from floor area alone
- Guaranteed performance from an unverified online estimate
Typical tasks
- Define the assessment deliverable
- Gather building and room information
- Review heat-demand assumptions
- Assess emitter and hot-water interfaces
- Report sizing recommendations and limitations
What to include in your brief
- Building plans or dimensions
- Construction and insulation details
- Existing radiators or underfloor heating
- Hot-water demand
- Planned building changes
Choosing the right professional
Ask what method and evidence will be used and whether the report covers rooms, emitters and hot water as needed. A useful assessment shows assumptions and missing information, rather than presenting a nominal unit size without explaining the building conditions behind it.
Important considerations
- Unknown construction details can introduce material uncertainty
- Later insulation or extension work can change the design requirement
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