Cylinder Stat for small Hw Cylinder

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G

geron

I have recently had the boiler and indirect (vented) Hw cylinder replaced and they did a reasonable job, but I was not specific enough about the new cylinder size, and being a narrow airing cupboard they installed only a CenterCyl HE85 to replace the 42x18 cylinder. In theory, according to the cylinder manufacturer, this should do the job, but the Drayton stat is very slow acting and has an 8C differential, so although in theory it should be fairly high recovery, it takes a long time to re-heat.

I can manage with this small cylinder, and it may be cheaper to run, but is there anything that can be done to speed up the re-heating response. All of the other cylinder stats I have looked at also have a large differential. I realise the current trend is for energy saving at all costs, so the systems are deliberately designed not to continually keep topping up the cylinder temperature, but this is at the cost of useability for systems with small cylinders, which must be more common now.
 
I fitted these fast recovery cylinders a while ago and i'm sure it had a 1/2 tapping at the bottom for a pocket type stat like ITC 100
 
There are 2 tappings at the bottom, but both are in use and I would not be able to insert the stat, but it looks interesting as the differential is half that of the Drayton etc.

I was considering moving the existing stat further down (currently about a third from the bottom), but don't know if this would work and I am reluctant to use trial and error and keep cutting holes in the insulation.
 
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