Especially one that feeds circuits like a cook-top, that need a 2.5mm2 feed from a CB, they draw more than 13A.
It's gas and only uses electricity for ignition, so uses very little power. The oven and dishwasher are likely to draw around 10A each though.
Usual practice over here is to run a 30A circuit for the cooker (range) with double pole isolation above counter level. It's quite likely that such a circuit is still in the kitchen somewhere! In this situation, I'd have taken the cable from the isolator switch to a pair of outlets under the counter.
