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Agreed, that's why I got the combi microwave as well. I've never needed that to go above 220C given that the few things I'd be cooking above that can all go in the main oven together.
I'm not sure if it will make much difference for frying pan pizza, that's all about the direct heat which is going to be the same regardless of oven size.
Someone in the home DIY thread can probably tell you for certain but I can't see an issue with running a normal oven and combi microwave oven. The draw isn't much more than a normal microwave (a couple of hundred watts extra) and is less than kettle, washing machine, etc
one of my biggest annoyances when cooking is needing to put two things in the oven at different temperatures and having to just wing everything to try and undercook one for longer and overcook the other shorter.
I've also finally got the hang of the old frying pan pizza technique recently and I think having a smaller oven cavity for the grill will help with temps as well as quicker preheating time. I'm not really a roast dinner kind of person so dont really need one massive oven.
a combi microwave would give similar utility but they only go up to 220c assuming all the sockets are on the same ring I may also run into load issues running effectively two ovens at the same time anyways.
if gas is a load of shite for oven cooking i'll probably stick with a single oven but surprisingly options for dual fuel freestanding cookers with just one oven are quite limited.