Outdoor Wood Furnace Info

All-Purpose OWF Discussions => Plumbing => Topic started by: dhymers on September 29, 2015, 07:04:06 AM

Title: Replacement pump - Grundfos Alpha pump?
Post by: dhymers on September 29, 2015, 07:04:06 AM

Good day all, I have to replace one of my circ pumps in the house.  Currently it is a Grundfos UPS 20-42 (Running on 3 speed) and was told the replacement would be a 15-58FC. 
The pump is for my second floor zone but I am in the process of renovating and am thinking of changing over to seperate zones through out the house. (Last winter was my first winter there and with one zone up and 1 down stairs I had cooler rooms and hot areas so would like to zone for better control in each room)

My question is, am I better off to spend a little extra money now on an Alpha 15-55F which would work now and would work after zoning (Or won't work)? Or is there a better pump recommendation or just stick to the 15-58FC for now?

Thanks,

Title: Re: Replacement pump - Grundfos Alpha pump?
Post by: atvalaska on September 29, 2015, 02:42:39 PM

They use less juice. Up here it is .25kw, them apha pumps work best on a zoned system.....say u have a 100foot  loop running then a zone vale opens up another 100' loop comes on line the pump will ramp up to keep the flow moving ...I have four of them now, I have one the I keep on #2constat it works best at that setting IMO ...near as I can tell they use 1/2 the power of there standard pump/

Title: Re: Replacement pump - Grundfos Alpha pump?
Post by: dhymers on October 02, 2015, 12:24:44 PM

Thanks, I ordered the Alpha pump in:)

Title: Re: Replacement pump - Grundfos Alpha pump?
Post by: dhymers on October 17, 2015, 08:18:53 PM

So I finally got the Alpha pump installed and just curious how in auto it pumps 6gpm at 26 Watts and in speed 3 it pumps 6 gpm at 43 watts...why the difference?

Title: Re: Replacement pump - Grundfos Alpha pump?
Post by: atvalaska on November 02, 2015, 02:29:28 PM

There ain't IMO , in auto mode it learns , I talked rite to GF one time about it ...they said  it uses/reads the power to push the water  by resistance, but u can make it push and burn more juice if u want ! ..I know I know...????? , I have found that #2 on the pesure side is best ...and it has to run for a week to learn !