1,314 kWh for the heat lamp, assuming it actually runs 24/7 with the same power consumption. In a leap year, it is 1,317.6 kWh. But what probably was overlooked... for two people.
With 1 or 2 children, electricity consumption increases again. More lighting, more entertainment electronics, more cooking, larger refrigerator or even a second one needed, etc. Then home office is also often underestimated. When I work from home, a workstation, HMI, 2-3 PLCs, etc. are running. You can't compare that with a businessman who has his 13" HP Elitebook with a 35W power supply on the living room table.
I already turn everything off here when not needed, using "Smart Home". But still, with 2 children, including garden irrigation and outdoor lighting that occasionally (not all night 24/7) beautifully highlights the house until 10 p.m., we will definitely never come in under 3,500 kWh, more likely close to 4,000.