Hey, Recently upgraded our heating system at home (combi boiler). It has 2 zones. Bedrooms and living area. I've set the living area to come on every evening for an hour 5-6. Bedrooms at 7-8. As the boiler is on for 2 hours and uses gas for this time would I be better off having both zones on in the one hour? Or does having 1 zone on use less energy than 2 zones on. 3 rads in bedroom zone, 4 in living area. Thanks
1 zone will use less energy as the boiler could modulate better. But it’s about comfort. No point heating the bedrooms earlier than intended if they start to cool down a bit sooner.