1. Room-by-Room Sizing Schedule
2. Whole-House Compliance & Heat Pump Sizing
NSAI SR50-2 Compliance Status
🟢 4 / 6 Rooms Pass (2 Upgrades Needed)
Low-flow heat pump ready with 2 radiator panel upgrades to avoid high winter electricity bills.
Total Heat Loss
7.4 kW
Recommended Heat Pump
8.0 kW Unit
Radiator Output @ 45°C
6.8 kW
Estimated Hardware Cost
~€320
📋 SEAI Heat Pump Technical Sign-Off Criteria:
✔ Heat Loss Index (HLI) must be ≤ 2.0 W/K/m²
✔ Radiators must deliver 100% room heat loss at design flow (45°C-50°C)
✔ Thermostatic Radiator Valves (TRVs) on all living/bedroom zones
✔ Unlocks direct €12,500 SEAI Heat Pump Grant
✔ Radiators must deliver 100% room heat loss at design flow (45°C-50°C)
✔ Thermostatic Radiator Valves (TRVs) on all living/bedroom zones
✔ Unlocks direct €12,500 SEAI Heat Pump Grant
Why Delta-T 30 Radiator Sizing Matters for Irish Heat Pumps
Traditional Irish kerosene and gas boilers pump water through radiators at scorching temperatures of 75°C (Delta-T 50). Modern Air-to-Water Heat Pumps, however, operate at their highest seasonal efficiency (COP 3.8 to 4.2) when heating water to a gentle 45°C (Delta-T 30).
Under the laws of thermodynamics (EN 442 European Standard), a radiator operating at 45°C emits approximately 48% of its rated 75°C output. If a contractor installs a heat pump without resizing undersized single-panel radiators, your heat pump will be forced to operate at high flow temperatures, burning hundreds of extra Euros in electricity each winter and risking SEAI grant disqualification.