Best CH/HW System for Hard Water Area

[carolus67]

I live in Leicestershire and the water has a Mg/Ca salts level of circa 100ppm, which is said to be borderline hard.

The heatstore CH/HW system has the advantage that it provides mains pressure HW. However due to water hardness the transfer coil in the heatstore which is at 80 deg C +/- is prone to fur up inside. Since the 'fur' acts as an insulator the heat transfer becomes very inefficient. I flushed the system with the recommended chemicals (acid) three months ago but the HW is starting to run out again.

Are there alternative systems which do not have this problem?

 

[spacethegas]

the mixer valves on these are very suspect.

 

[carolus67]

Spacethegas

The unit I have is a Flowmax which was long ago superseded by a 'better' model. I replaced the mixer valve (unit cost £85 or so) two years ago and have not had problems since.