We’re trying to find out what kind our boiler is (Ideal Mexico Super 2 model) but it’s listed as a condensing boiler. What’s the difference between this and a combination boiler?

I have only seen or heard of condensing boilers that generate heating hot water, but never steam. Does such a boiler exist and, if so, which company makes it?
This is a steam boiler that recovers heat from its exhaust to preheat the entering water. If you don’t know the answer, please don’t ask me why I want to know, just move on. Thanks!
So I just realized why this will most likely not work. The returning condensate in a steam system will be too hot to effectively absorb heat from the exhaust and condense it.

my husband wants to know!

.Inside the boiler insulated case not the heat exchanger.

to re-position any replacement to the current ‘Diplomat’ cast iron model would be very awkward and with an open vented gravity system could I possibly get exemption from John Prescotts ‘SEDBUK A/B’ ruling by fitting the most efficient alternative (as a condensing boiler might not run at top efficiency anyway without significant modifications all round)
Why is there no reference from boiler manufacturers to SEDBUK B grade. I think wet Central Heating is getting too complex and I may consider gas wall heaters instead.
Are things improving out there regarding earlier ‘teething’ troubles with condensing boilers and are conventional boilers still being manufactured?

i want a cheap and efficient type,cheers