Life / cost of central heating installation in Wroclaw [4]

Hello all

We're renovating our flat in Wroclaw and have contact with a recommended plumber. He has quoted quite a high price to us for taking out our old heating system and putting in a new one ... going from duel boilers to a combi with 6 modern radiators. New Bathroom suite as well.

Any ideas on 1: Avoiding being conned as we may seem to be rich foreigners but actually we live and work locally. 2: What such work should cost on average here in Poland.

Many thanks

Jaszu Morgan