On a private water supply in the Scottish Highlands.
Gravity-fed, spring source - soft, somewhat acidic (pH 6.3 when last tested).
Looking to replace our (27ish year old, Grade 2) existing copper cylinder with a suitable stainless steel replacement.
System is open-vented, indirect. 28mm coil, 28mm / 1"BSP fittings for cold feed/hot water draw-off.
Any pointers? And if our copper cylinder has lasted 27(ish) years, are we likely to have any corrosion issues with a stainless steel cylinder? 316L vs Duplex vs Super Duplex?
Wanting to move away from copper because the cylinder/pipework is clearly corroding (tell-tale blue/green staining of sanitaryware, etc), amid other reasons.
Many thanks to all!