Looking for recommendations for stackable washers & dryers to go in a cupboard.

Hello there. Arguably a cupboard is just a very small room 🙂 as long as the door is left open air can circulate all around and as long as it can get underneath as well (so don't sit it on a carpet). However, as you have noticed, modern washing machines are quite deep. This is to accommodate the extra large drum capacities.

So typically a washing machine or washer dryer will stick out 2 or 3 inches from under a worktop surface, whereas in the past they would fit flush.

I can't offer, "expert" advice regarding the safety of operating one in the cupboard, but it's fair to say that most washing machines are pushed into the space under the kitchen worktop and pushed all the way back until they will not go any further.

There is a natural gap because of the plumbing, or a wall plug, which is usually behind the washing machine, at least in part. Even if there is nothing at the back, I would expect that the vast majority of washing machines are pushed in as far as possible.

Another thing to consider is that most, if not all washing machines, are designed in such a way that the back of the washing machine cannot be pushed flush against a wall. They usually have a lid overhang. This means when you push one all the way back to the wall the back of the lid hits the wall but there are a couple of inches between the wall and the back panel.

Hopefully the cupboard is not upstairs? I would always caution against putting a washing machine upstairs in case it ever leaked, or flooded. It can cause damage to the ceilings or in worst case scenarios flood the downstairs underneath. Washing machines are much less likely to flood these days but it still possible.