fitting new hot water cylinder - which way the heating coils

[Albatross]

I'm changing my indirect hot water cylinder. All the diagrams and internet info says that the boiler feed goes in the top of the coil and returns out the bottom. But my old tank had it the outher way. Boiler Feed in the bottom of the coil and return out the top. Does it make any difference ?

Second question... I'm puting the 1" to 22mm female coupler on the 1" male screws. Do I need fibre washers on the back end and boss white or equivalent on the threads ? I suppose so...

 

[buck51]

cylinder connectors are usualy tappered, should not need it but you could put some ptfe tape on the tapper.

 

[gigz]

Old way (gravity systems) used to got flow/top (hot water rises) but on modern pumped systems i've seen loads piped flow to bottom and they work ok. If i fit a new system i pipe flow to top out of habit but i don't think it makes any difference. Quick tip for you, fit a piece of 22mm copper into the female irons, nip it up. Wrap your PTFE around a pencil then wind it onto the coil tappings then use the nut to screw it on, saves taking loads of lagging off the cylinder.

 

[Albatross]

Thanks for the tips. Especially the one with the pencil for PTFE. Simple idea. I'll try that.

 

[ALEC1]

you put the feed in the bottom to increase capacity of the cylinder, and at the bottom to maximise stratification; some thing you want with a condensing boiler to ensure the return is as cool as possible.

 

[Albatross]

you put the feed in the bottom to increase capacity of the cylinder, and at the bottom to maximise stratification; some thing you want with a condensing boiler to ensure the return is as cool as possible.

This is very interesting, but you said "bottom" on each statement, did you mean one of them to be at the top?. I'm thinking that stratification is better at the top entry as it gets colder towards the bottom. Right ?
Many thanks,

Dave