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Heat Pump Feasibility
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Heat Pump Feasibility
Simplified heat loss, sizing, grant eligibility — CIBSE AM17:2022, SEAI & MCS guidance
Country
🇮🇪
🇬🇧
Build Type
Existing
New Build
🇮🇪
Active Regulation
CIBSE AM17:2022 — Heat Pump Installations
SEAI Domestic HP Technical Guidance (2025) · Verified 2026-06-15
CURRENT
🏠 Building Fabric (for heat loss estimate)
Total Floor Area
(m²)
External Wall U-value
(W/m²K)
Roof U-value
(W/m²K)
Floor U-value
(W/m²K)
Windows U-value
(W/m²K)
Air Permeability
(m³/(h·m²) @50Pa)
Affects infiltration heat loss. New build: ≤5 (IE) / ≤8 (UK)
♨️ Heat Pump Configuration
Heat Pump Type
GSHP achieves higher SCOP but requires ground works
Air Source (ASHP)
Ground Source (GSHP)
Flow Temperature
45°C
Lower = higher SCOP · UFH/fan coils → 35°C · upgraded rads → 45°C · existing rads → 55–65°C
35°C (UFH)
45°C (Upgraded)
55°C (Existing)
65°C+
Include DHW (+2 kW uplift)
CIBSE AM17 Appendix A
💶 SEAI Grant Eligibility (Ireland)
Year of Construction
Built before 2021 = generally eligible
Existing Heating System
Replacing oil or gas may attract bonus
Oil boiler
Gas boiler
Other / none
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