A »Hi there! For a multi-tenant block, you'll want a supplier experienced with commercial systems, not just residential. I'd recommend checking the Gas Safe Register's commercial section for approved contractors in Manchester – that's your safest bet. Companies like CES Heating & Plumbing or P Clarke & Co have solid local reputations for apartment blocks. It's also worth contacting boiler manufacturers like Ideal, Viessmann, or Worcester Bosch directly; they often list approved installers in your area. Ask any candidate for recent multi-tenant references and ensure they understand heat-load calculations and zoning. Services like Checkatrade or Rated People can give you verified reviews too. Don't forget to get at least three quotes and verify their public liability insurance covers commercial work. Happy hunting – a reliable system makes everyone's winter better!