new indirect cyl - copper or stainless steel ?

[mahogany]

Need to replace my 36x18 copper indirect cyl for the 3rd time in 36 yrs. Hard water plays havoc here even though I have my boiler temp cranked down to 65 (brrrr) and one of those electric magebtic coil thingies on the rising main.

I see Screwfix have stainless versions: Sounds like a better proprosiiton? - any views /snags. What about dissimilar metals at the joints?

Also , I believe Regs have changed for thermostats in immersion htrs so I should not use my old stat even if it fits?

 

[GaytonTonner]

Get SS. Use an insertion stat for the cylinder, not a clamp on - a probe.

You might want to fit a direct cylinder without a coil. Then fit a plate heat exchanger and brass pump to heat the cylinder. The recovery rate is amazing compared to a coil and you can downsize the cylinder saving on the purchase. The boiler and cylinder combine to supply hot water.

 

[mysteryman]

Control the cylinder to no more than 55C with the thermostat above the coil, and it should last longer. Stainless should be more durable.

 

[RigidRaider]

Move to Lancashire. No limescale here, water comes straight from Thirlmere.