Baxi Luna Duo Tec Boiler

There are only a handful of boilers available in Australia. We use and highly recommend Baxi boilers. One of the reason they are currently Australia’s most efficient hydronic heating boiler is due to their modulation ratio.

In simple terms, the modulation ratio is a boiler’s ability to reduce its maximum output to its minimum output.  A narrow modulation range gives a poor ratio whereas a wide range provides a good ratio.  For example, if a boiler has a maximum output of 30kW and a minimum output of 7.7kW its modulation ratio is less than 4:1.

Meanwhile, a boiler with a maximum output of 30kW and a minimum output of 3kW has a wider (hence better) modulation ratio of 10:1.  As a general rule, for a boiler to be classed as having a ‘good’ modulation ratio its minimum output should be one fifth or one sixth of its maximum output.


Hydronic Heating Systems provide award winning installations in the City of Shire of Yarra Ranges, Badger Creek, Belgrave, Belgrave Heights, Belgrave South, Chirnside Park, Chum Creek, Coldstream, Dixons Creek, Don Valley, Ferntree Gully Upper, Ferny Creek, Gruyere, Healesville , Hoddles Creek, Kallista, Kalorama, Kilsyth, Launching Place, Lilydale, Macclesfield , Menzies Creek, Millgrove, Monbulk, Montrose, Mooroolbark, Mount Dandenong, Mount Evelyn, Narre Warren East, Olinda, Sassafras, Selby, Seville, Seville East, Sherbrooke, Silvan, Steels Creek, Tarrawarra, Tecoma, The Patch, Tremont, Upwey, Wandin East, Wandin North, Warburton, Warburton East, Wesburn, Woori Yallock, Yarra Glen, Yarra Junction, Yellingbo, Yering