what do the pump numbers mean?

[cjard]

Looking for a 10 port manifold for underfloor heating and I find various pump numbing options, usually 15/50 or 25/60. It seems to be related to size, but I'm not sure whether that is a physical length/diameter, power/pressure etc. Any idea?

Manifolds seem to vary between 300 and 500 quid depending on who makes the kit. A no name manifold with IBO 25/60 pump is 300, same manifold with a grundfos 15/50 is 350, emmeti manifold with lowara pump is 470, poly plumb manifolds are £££

I'm of a mind that the manifold is really just a lump of metal and likely to be much of a muchness, but the pump is going to be the thing with the ongoing and replacement cost. The other manifolds I have, installed by the screed company are emmeti/lowara - is it for good reason? Is the 130 quid premium for another, over the ibo/noname money well spent?

 

[muggles]

You'd like to think that the more expensive one would be less prone to leaking - they have rather a lot of joints on them

Normally I buy UFH as a complete kit direct from a manufacturer - this ensures that it has been designed correctly, that all the parts are compatible, and that you don't end up running around trying to compare manifolds. You'll end up with no warranty if you start mixing and matching, as the manufacturers will all blame each other if you get issues. One supplier means one point of call for the warranty

Pump numbers relate to the size of the ports on the pump, and the amount of water it is capable of shifting. Pumps should be carefully matched to the UFH system to ensure your system performs correctly. Again, a UFH supplier will specify this for you

 

[cjard]

You'd like to think that the more expensive one would be less prone to leaking - they have rather a lot of joints on them

Normally I buy UFH as a complete kit direct from a manufacturer - this ensures that it has been designed correctly, that all the parts are compatible, and that you don't end up running around trying to compare manifolds. You'll end up with no warranty if you start mixing and matching, as the manufacturers will all blame each other if you get issues. One supplier means one point of call for the warranty

Pump numbers relate to the size of the ports on the pump, and the amount of water it is capable of shifting. Pumps should be carefully matched to the UFH system to ensure your system performs correctly. Again, a UFH supplier will specify this for you

Agree with what you say, I just couldn't justify the quotes I'd been getting even for supply only - the keenest was £2400 but for what I needed (I already have some of the control gear from when the screeders installed the downstairs stuff) I only need to lay out about £1000. Supply and fit prices were £8K +

Given the upstairs is the same size as down and the same number of manifold ports/loops I guess I can make do with looking at the downstairs pump and getting the same one. At these prices I don't much care for warranty - if it conks out I'll buy another if it's not covered. I could make my way through a fair few units before I've spent more

 

[Dan Robinson]

Warranty isn't just about it conking out.

 

[MJGas]

Thought you were ****ing off for 2 weeks?

 

[Dan Robinson]

If Mustafa can't count the days, mass flow rate is going to really throw him

 

[cjard]

Still inviting an answe to the original question gents.. 25/60, what does it mean?

 

[MJGas]

Looks like your here to stay.

 

[MJGas]

25mm ports/ 6m of head

 

[muggles]

Still inviting an answe to the original question gents.. 25/60, what does it mean?

25mm ports, 6.0m pumping head

 

[cjard]

Dare I even ask, if there's a rule of thumb regarding how much head she should give for a particular application?

This is talking about the pump, mind

 

[muggles]

Dare I even ask, if there's a rule of thumb regarding how much head she should give for a particular application?

This is talking about the pump, mind

If your tubes have higher resistance, more head will be required to produce a satisfying result....

 

[cjard]

So long as she's warm I find she doesn't moan too much. Can't believe I've had to sling nearly a kilometre of the pert stuff at it so far though

 

[Dan Robinson]

So long as she's warm I find she doesn't moan too much.

You're doing it wrong then.

 

[Storms]

http://www.comfort-calc.net/circulator_sizing.cfm should give you everything you need, I think. Now pizz off

I'm stuck...
what is the 'flow rate required' for the boiler? In the boiler manual it tells me the 'minimum flow rate' for DHW... but I need the minimum flow rate for Central Heating. Can you help? Boiler is Baxi Main Eco Elite 30