Usage varies massively…. which is potentially good news, because that means there is potential to reduce it.
We had a couple of nights away in May, and on the day when the house was completely empty, it used 3.4kWh. Before we went away for our main holiday, I turned off at the plug everything I could reach which didn’t have to stay on. The average then was under 2.5 kWh per day. So there is scope for us to reduce.
Here are a few ideas to help reduce usage.
Gas:
Turn down the flow temperature on your condensing boiler to 55 degrees, or lower if you can. This will enable it to work more efficiently, and could save 5-10% of your usage. May need to have it on for more of the time to reach a comfortable temperature, but will cost less.
Reduce the hot water temperature to 40. If it’s set at 60 or 70 (they often are), you will mix it with cold at the tap to get a comfortable temperature. Save energy by not heating it as high in the first place. WARNING this applies to combi boilers. If you have a boiler with a separate hot water tank, that needs to go to 60 for a couple of hours once a week to avoid the risk of legionella. But it can be lower the rest of the time,
Switch the hot water on your combi boiler from Comfort/Convenience mode to Eco. This means it will no longer fire up every 90-120 minutes, just to get hot water to the taps quicker. Saves you 1.5-2 kWh per day.
In winter: close curtains at dusk. Close doors and allow the temperature in the hall/landing to stay lower.
Electricity:
Change all lightbulbs to LED. If you’ve got a lot, start with the ones which spend most time on.
Wash at the lowest temperature possible - try 20, especially for stuff which isn’t really dirty.
Washing machine and dishwasher - check your user manuals to see which cycles use the least energy. Run them full as much as possible. Tumble dry as little as you can get away with.
When replacing appliances, look at the energy usage - lower is better. Heat pump tumble dryers use a lot less energy (but cost more to buy).
Use an energy monitoring plug to find out what your appliances and electronic devices use. Target the electron guzzlers for switch off at the plug or smart plug to turn them off on a schedule.
Draught proof.
Got a double oven? If temperatures of the things you are coming are within 20 degrees, see if you can just use the one oven and shorten the cooking time of the thing that should be on a lower temperature. Use a steamer to cook your vegetables over the potatoes on a single ring. Use the microwave and slow cooker more, oven and hob less.
Fridges and freezers - some people seem to have multiple ones. Do you need them all? Could you retire one? They will use about 1kWh per day each.