Hello,
My Granny has a Vaillant turboMAX+ combi boiler, I am posting because I am little worried that the boiler may be condensing when it's not supoosed to.
The system has very large radiators all with TRV's on them (No room stat) a flow temperature of only 55 degrees is required to warm the house on freezing cold days.
I am worried that with such low flow temps the boiler will be condensing which may corrode the heat exchanger.
Is it a thing to worry about?