Concrete or Steel liner

1st post on here so hello everybody, We are about to purchase a new Dunsley Highlander 16 Boiler stove for our recently purchased old weavers cottage that we are renovating my question is this, We have had 3 Hetas engineers round quoting for the job with very different solutions, it must be pointed out that there is already a Dunsley open fire with Back boiler installed in the property so the plumbing for the rads etc is all present and working fine so theres not much plumbing to do just some modifications to install the stove
The first Hetas guy smoke checked the chimney which has no flue but indicated that the chimney was fine and could just swap the fire for the stove make good the plumbing and charge £400
The 2nd was horrified that the 1st guy suggested no steel flue was necessary (im inclined to agree) and for him to fit new flue plus install he wants £1200
The 3rd guy came today and whilst he was happy to sort the plumbing for the stove he suggested a property like ours should have a concrete lined chimney and advised of a local contractor in this field. Not sure what the costs of this would look like till this company can come out but my instict tells me that it sounds very expensive!
Apologies for long winded first post but could really do with some advice on this and hope ive posted in right section!

chimneylinerjames said:

Stainless steel liner. Easier and faster to install, less labor = Big time savings.

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Thanks for your reply James the steel liner option seems the obvious one but after speaking to the engineer this morning he was saying with a wet system i would be lucky if i got 5 yr out of it before it would be perished, in fairness to him the hetas installers manual he was holding backed up this claim, do you know of any examples of how long these liners last on a wet system?

I agree with you that its absurd he should say its ok the chimney passes my 9yr old daughters bedroom how irresponsible! Its an old stone house i would say the chimney would be the same but yes its definitely unlined, as i said in earlier post my concern is that if i go for the steel liner how long would that realistically last with a boiler stove.