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Christ, yeah. Remember the vendors have almost certainly selected the estate agent who said they'd get the highest price, so have already started house hunting for their next place with that figure firmly in their minds. If someone offers way below that, i.e. more than 15-20% of the asking price, then they take offence as their dreams of their new home at the top of their budget, recede into the distance.
Send them a link to that research and explain that the stove is devaluing the property so naturally your offer will reflect this?
(Call the estate agent and make an offer over the phone, they will then ring the client. You can offer what you like but bear in mind if they think your offer is bare jokes it might reduce your chances of a successful outcome. It's totally OK - and worth doing - to explain the thinking behind your bid to the agent so they can relay that too).