I'm learning a lot. Thank you.
In some ways, it's hard to reconcile the new knowledge with my 20 year old oven set up.
So, um, where I live we have a library. And from the library, we can borrow different meters to test energy efficiency around the home. Add to that the extremely detailed reports the power company gives us... and I love geeking out about energy efficiency.
Like for example, using
hot water to fill the kettle in the summer uses considerably more electricity (and time) than cold
water from the well. But in the winter when the spillover heat from the heatpump is heating our
hot water, it's more effect to start with hot water from the tap to fill the kettle. Just little things like that make me happy to know and might be useful if we ever get a chance to pop off the grid.
When I hear about the quick pre-heat time, it makes me think of the current oven's electrical use is almost entirely in the preheat stage.
We generally cook between 300-350f. and the preheat stage takes about 7 minutes. The first ten minutes of the oven being on take approximately the same electricity as the next 2 hours of maintaining heat (to put it in context, it's considerably less than charging an electric car at normal rate). More items in the oven, slightly lowers the amount of energy to keep it hot after the first half hour. Not a lot, but
enough that we find that it's most efficient to cook a large amount for 2 hours in the oven. This is the way we are trained to use the oven, so it's hard to get my head around different use cases. Maybe that's where I'm struggling.
The current oven is also really well insulated (possibly too well? we didn't do the install so I'm scared to look) so the heat doesn't come out into the house very quickly - but it takes a few hours to cool down. All that heat has to go somewhere.
So... new ovens.
They heat up faster, does this mean it's a more significant draw to heat up or is the technology improving? The fan helps?
I don't know why my brain has dug my virtual heels in on this. In the end, the family will probably just buy an oven with the right colour, energy grant, and good warrantee. I guess I just want to understand it better so I can know how to get the most out of the oven they choose.