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After 3 years of faithful service, my Taco Bumblebee (HEC-1 I believe) died last night. It is the only circ on my old converted gravity system. No power to the screen, no noise, just died peacefully. Bummer. I liked that little guy. I used it because on my system, “constant speed 2” was a perfect match at 10-11gpm. Anyway. I’m warming up the car now to run to the local Menards before work... they have a Taco 007 (WAY too much pump for my system), Grundfos 15-58 3-speed (speed 2 looks like a good match), and a “HydroSmart” 3-speed whose curves roughly match those of the 15-58. My only concern is that the Bumblebee seems to be 6-3/8” flange to flange and the Grundfos (which is the way I’m leaning) is listed as 6-1/2” flange to flange. That shouldn’t make any appreciable difference, should it? I do have a little flex in my piping to play with (all 1-1/4” copper, and thank goodness for isolation valves). It’s been -9°f since last night and the house is staying about 60° thanks to gravity flow (no IFC), but it’s expected to drop further with higher winds again today. Ugh. I also don’t like leaving the boiler to bounce off it’s hi-limit even though I know it’s not hurting it (cast iron, hi-limit at 175°). Yesterday was the day of days, that’s for sure. Cripes.
Ford Master Technician, "Tinkerer of Terror"
Police & Fire Equipment Lead Mechanic, NW WI
Lover of Old Homes & Gravity Hot Water Systems