What do UKWTA say about water softeners and your central heating system.

Can I put softened water in my central heating system?

Yes! British Standard BS 7593:2006 Code of practice for treatment of water in domestic hot water central heating systems has recently been updated and now allows systems, including those with boilers with aluminium heat-exchangers, to be filled with softened water provided that a corrosion inhibitor specifically formulated for the purpose is added and properly maintained.