HI Drake, Flow rate isn’t all that important for hydronic. Most all systems just use a single pump and multiple zones.
I’d go with a multi speed from taco or grundfos or there are a few others if you are going AC. You’ll save yourself close to 500 $over the 26-99F such as the grundfos UPS15-58 1/25 hp 3 speed should do it. jay > On Jun 18, 2025, at 2:47 PM, Drake Chamberlin via RE-wrenches > <[email protected]> wrote: > > I am considering using a Grundfos Alpha1 26-99F, ECM circulating pump for our > off grid hydronic heating system. The pump is regulated by a 0 to 10 Volt > external device measuring temperature and pressure. > > What specifically is that device, and where does it go in the system? > > Thank you, > > Drake > > Drake Chamberlin > > Athens Electric LLC > > Ohio Electrical Contractor’s License 44810 > > NABCEP Certified PV Installation Professional > > > -- > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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