Power output of 'standard' hot water cylinder coil

[oldbutnotdead]

Contemplating a thermal store to link woodburner to heating system but it's about £5k overall so fancied trying an experiment first with a spare 400 x 900 (115 litre ish) hot water cylinder I have kicking about. Does anyone know how many kw/hour the coil will typically deliver to the cylinder- if it is only the nominal 3kw mentioned in various sites then the experiment will be a waste of time, I can't remember how long it used to take to get to temperature on the system it came out of alas. TIA

 

[fixitflav]

Contemplating a thermal store to link woodburner to heating system but it's about £5k overall so fancied trying an experiment first with a spare 400 x 900 (115 litre ish) hot water cylinder I have kicking about. Does anyone know how many kw/hour the coil will typically deliver to the cylinder- if it is only the nominal 3kw mentioned in various sites then the experiment will be a waste of time, I can't remember how long it used to take to get to temperature on the system it came out of alas. TIA

If it's any help - I have a regular boiler with conventional HW cylinder. Boiler is rated 15kW and the transfer to the cylinder is well below that. The boiler goes off on control-stat several times before the cylinder stat is satisfied. It's probably doing about 3kW as a guess but no way of knowing the ΔT or the actual volume heated at all accurately.
But the cylinder is 20-odd years old and I think there's plenty of scale on the outside of the coil. I've scrapped old cylinders and emptied a bucketful of greenish crystals out. A new one would be a lot better but yours won't always be new.
BTW kW is power, you don't need the /hour.

 

[oldbutnotdead]

If it's any help - I have a regular boiler with conventional HW cylinder. Boiler is rated 15kW and the transfer to the cylinder is well below that. The boiler goes off on control-stat several times before the cylinder stat is satisfied. It's probably doing about 3kW as a guess but no way of knowing the ΔT or the actual volume heated at all accurately.
But the cylinder is 20-odd years old and I think there's plenty of scale on the outside of the coil. I've scrapped old cylinders and emptied a bucketful of greenish crystals out. A new one would be a lot better but yours won't always be new.
BTW kW is power, you don't need the /hour.

Cheers chap- and I've proceeded further down the thought curve (that sounds very w*nky but hey) and concluded it is most unlikely that my 115 litre cylinder has a 13 kw coil in it (which is the rated output of The Beast) so my experiment in its original form would be an epic fail. So Plan B time.......