I initially made contact with Viessmann to establish which boiler would be best for my circumstances and received excellent guidance plus a referral to the local Viessmann installer. Following an on-site assessment, the new Viessmann Vitodens 100-W system boiler 32kW was recommended followed by a quote for boiler and installation costs - which were very competitive. An installation date was agreed and the local installer arrived on time, was very efficient and installed the new Viessmann Vitodens 100-W system boiler 32kW with a 10 year warranty. No problems at all and a very effective boiler for running quite a large central heating system. Much more efficient than my previous boiler which was about 22 years old!