yes we are in percival street and we are on to unit number 3! for gas hot water, got told the same thing at last installation, that it is the water. Seems to be worse since the earthquakes.
our latest is a Rinnai but did have a Bosch cannot recall what the first one was it lasted the longest, def think the water issues is post EQ.
– Zarnia Morrison, Sydenham
– Facebook reply to our local inquiry, CCC water burns Cashmere HWCs, noted at chchwater.wordpress.com/2017/07/10/cra-to-south-chch-neighbourly-10-7-17