High Efficiency A Rated Circulating Pumps

John.G

Looking to treat myself to one of the above for Christmas even though my trusty Salmson NYL 33 pump is still serving me well after ~ 18 years, this is a "4.5M" pump at speed 3 but I have always run it on speed 2 which is ~ a 3.5M pump at this speed.

I was looking at the PP (Proportional Pressure) settings on both the Grundfos UPS2 and the Wilo Yonis Pico 1-6 pumps both of which are 6M pumps.
The UPS2 has "only" 3 PP settings all of which are quite close ie setting (i) 2.7M setting (ii) 2.8M and setting (iii) 3.0M.
The Wilo has numerous PP settings ie to mention a few of them: 5M, 4M, 3M and can be incrementally set in 0.1M stages.
While the UPS2 would no doubt do the job for me fine if I set it on PP setting (iii) 3M, I am wondering why there are no higher settings above 3M on this particular pump. In other words if one was replacing a 5/6M circ pump then one would tend to opt for the Wilo because of its higher PP settings.
The Heat Merchants HM Pro 4-7 has 6 PP settings. Someone posted that this is a re badged DAB Evetron 4-7.

John.G

Christmas came early and I purchased and installed the above a few days ago. To achieve the same performance as the Salmson I finally set it on a Proportional Pressure setting of 4M, the actual pump head at this setting with all rads and cylinder coil in service is 2.9M which gives a flow rate of 13 LPM with pump consumption of 17 to 19 watts. The temperature rise (DeltaT) through the 20 Kw oil fired boiler is 22C. I have 10 rads, 6 double and 4 single, 8 with TRVs, the other 2 are controlled by 1 room thermostat. I don’t see any big difference in the pump power, maybe a watt or two, even if I manually shut off 2 or 3 rads and even the cylinder coil motorized valve opening/closing doesn,t seem to have any big effect but its early days yet and I will keep monitoring.
Based on these numbers it looks like the Grundfos UPS2 would not achieve this flow rate, 13 LPM @ 2.9M head, as the UPS’s maximum PP setting is 3M which would result in a flowrate of only ~ 7 LPM @ 1.6M pump head, this means that the UPS pump would have to be changed to one of its 3 fixed speed settings unless I am misinterpreting the grundfos pump curves. There must be literally dozens of CH systems here in Ireland like mine that require a pump head of 2.9/3.0M and its hard to imagine that all these pumps are running on fixed speed??.
My savings based on a 240 day heating season with pump running 15 hrs/day and 18 watts vs the Salmson’s constant consumption of 46 watts is ~ 240*15*(46-18)/1000*0.18, €18.14/annum.

jimf

hi john g

by any chance do you have a relation called andy from Sligo

John.G

jimf wrote: »

hi john g

by any chance do you have a relation called andy from Sligo

Not yet Jimf!.

jimf

John.G wrote: »

Not yet Jimf!.

:P:P

agusta

jimf wrote: »

hi john g

by any chance do you have a relation called andy from Sligo

What pump do you have jim

Wearb

Tom44 wrote: »

240 day heating season !
15 hours a day running !

Are u in Lapland ?

I think (day numbers) it would average out at close to that across the country, though well reduced heat call hours at beginning and end of season.

Modern a and b rated housed would be different, but those would not be the average houses.

jimf

agusta wrote: »

What pump do you have jim

not sure dec will check when home from the pub at about 3.30 am and will post then


not that ye will understand :D:D:D:D

agusta

jimf wrote: »

not shure dec will check when home from the pub at about 3.30 am and will post then


not that ye will understand :D:D:D:D

It looked like a Z rated pump the one i saw:),poor efficiency,maybe u upgraded it.ive a grundfos ups2 if ur interested.its not second hand:)

jimf

agusta wrote: »

It looked like a Z rated pump the one i saw:),poor efficiency,maybe u upgraded it.ive a grundfos ups2 if ur interested.its not second hand:)

dont you know PUMP is a dirty word to me at the moment :p