Around 1kW in. 3–5kW of warmth out.
That’s the whole trick: instead of making heat from scratch, a heat pump moves warmth from the outside air into the home. It’s why running costs fall so sharply against LPG or direct electric heating.
With just five moving parts, automatic defrost through winter and a 20–25 year design life, it’s a simple machine doing a simple job — for decades.