unvented secondary return

[fuzzy]

Scientifically speaking............It will cool, even the cylinders have a heat loss of about 2.5 kw in 24hr period (approx) with the 2" foam they have applied. Doesn't matter how well insulated the flow and return are on the hot water side you will have heat loss of some description.

never said you wont get heat loss, im pointing out that there is no reason why the heat loss will be anymore if it is lagged the same.

commercially this is alwasy the case, from some posts here i get the feeling people are undervaluing returns based onheat loss which doesnt need to be so

 

[Gray0689]

Fuzzy your talking about commercial not domestic it does cool cylinder and it won't be lagged with 50mm insulation
I've fitted approx 50 secondary returns on large domestic property's and seen it done a few different ways the only one that works well is on a timed pump if on 24/7 cools cylinder considerably
As been stated before secondary returns are only good if there is very Long pipe runs this can be done away with if the likes or architects /designers could position cylinders boilers in more central positions in houses but as we all know this don't happen

 

[fuzzy]

Fuzzy your talking about commercial not domestic it does cool cylinder and it won't be lagged with 50mm insulation
I've fitted approx 50 secondary returns on large domestic property's and seen it done a few different ways the only one that works well is on a timed pump if on 24/7 cools cylinder considerably
As been stated before secondary returns are only good if there is very Long pipe runs this can be done away with if the likes or architects /designers could position cylinders boilers in more central positions in houses but as we all know this don't happen

ive also done it on large domestic, same theory applies, just lag it properly, i dont see the problem

 

[Gray0689]

ive also done it on large domestic, same theory applies, just lag it properly, i dont see the problem

Tell you what fuzzy we will agree to disagree then lol

 

[fuzzy]

Tell you what fuzzy we will agree to disagree then lol

lol, ok mate, well agree that i am always right, a bit like the missus in out house:49:

 

[Gray0689]

lol, ok mate, well agree that i am always right, a bit like the missus in out house:49:

If you say so mate lol I've one like that too

 

[gil]

This may be a silly question. Sorry in advance. Does the pump act as a stop valve when it's not running, or does it sort of freewheel, allowing a gravity circulation to take place?

 

[fuzzy]

This may be a silly question. Sorry in advance. Does the pump act as a stop valve when it's not running, or does it sort of freewheel, allowing a gravity circulation to take place?

standard pump so will offer restriction but no non return. gravity wont take place on most as it would have to run up continually this is unlikely