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[Range91]

I have to buy another pump for my garage loop I just installed. I am wanting some input on a pump. I have a grundfos 15-58 now for primary and have that set on low which feeds the house needs fine with DMH and Furnace. I have also ran on medium to do the garage loop while closing purge Tee. I was wanting to know if I move the grundfos to my second loop and get a delta t pump or at least a ecm pump would that make sense price vs what i am getting. I have a 100ft run to boiler. I know there are a lot of people here who have tried all sorts of different setups and am looking for suggestions. Thanks

[RSI]

If the 15-58 is big enough then you can use most of the ECM pump options. I would use the existing 15-58 on the secondary loop since it most likely wouldn't pay off using an ecm pump there with it only running on call for heat.

If you want a delta t pump, I would look at the Taco Honeybee.  Otherwise if you just want to go with constant flow, There are several that should work. The Grundfos Alpha is a little smaller than the 15-58 but from what you have said, sounds like it should work. The Armstrong 20-20CI is the same size as the 15-58. I am running one of each on my boiler and so far like the Armstrong better. There are others out there too but not really any cheaper.

[E Yoder]

We use a lot of B&G NRF-22's and 25's. Have done very well.

[aarmga]

I hear the Armstrong pumps are pretty darn efficient.  If I am in need of a pump ever again I'll be getting the Armstrong or the grundofos pump.  Right now I should have enough pumps for a while.  The original broeder is still kicking, I have a spare in the basement and an Eltron pump waiting to go on.

[RSI]

Armstrong is supposed to be releasing ECM versions of the E.2 pumps some time this year. I am thinking an E9.2 variable speed would work on pretty much any OWB system out there.
I am hoping it doesn't add much to the cost over the current single speed model.

[mlappin]

Armstrong is supposed to be releasing ECM versions of the E.2 pumps some time this year. I am thinking an E9.2 variable speed would work on pretty much any OWB system out there.
I am hoping it doesn't add much to the cost over the current single speed model.

Does anybody but Taco offer a Delta T pump? I like the one I have so far, just never overly impressed with Taco.

[RSI]

Not that I know of but there are probably some out there. I quit looking for them when I started dealing with Heatmaster and had the minimum flow requirements to deal with. Now that it isn't an issue any more.
One problem is being able to mount the pump at the boiler and have it sense at the heat exchanger. If sensing the return pipe at the boiler, it would have a huge delay.

[mlappin]

It’s not that bad of a delay and it does compensate rather quickly. I have my sensors at the stove, fastened securely to black pipe, with a layer or arctic silver (CPU thermal paste) between the sensor and pipe then wrapped in three layers of low E foil. Just couldn’t see pulling the sensor wires with the power wires, bad things can happen even with shielded or twisted pair sensor wires and wasn’t about to run a separate conduit just for the sensor wires.

I just simply installed a third small pump to compensate for when the taco is running slow. The other pump to the shop is a standard three speed.

[RSI]

If the pump is only moving 1-2 gpm it could take minutes for it to react. I can't see that working too good with a plate hx for DHW.
I think I would rather use an ECM pump on low setting and another pump in the house on an aquastat to supply the full GPM when needed.

[mlappin]

Hasn’t been an issue yet, can’t remember the setting per factory but one of the dip switches is set not to run at minimum speed. Can’t remember the difference, maybe instead of 1-2 gpm its more like 3-4 gpm on low.

One of these days out of curiosity I’ll have the wife turn on the snow melt and I’ll watch the pump to see how long it takes to start to ramp up, I’d prefer to have immersion type sensors but thats another whole headache in itself. If its cold enough out and the glycol is at 0 or lower I imagine the return might be quite cool at first although thats on a secondary loop as well with a small pump running on low.

[RSI]

Do you have a Bumblebee or one of the 00 models?

[mlappin]

00 models. The entire secondary loop is 3 foot total length, so low to non existent head, all in 1” copper with long radius elbows.

 Just checked the taco at the stove, running at its lowest speed the sidewalk is pulling 8 degrees and it’s been on since 5 pm.

[RSI]

The 00 delta t pumps don't have ECM motors, do they? I thought only the Bumblebee does.

[mlappin]

The 00 delta t pumps don't have ECM motors, do they? I thought only the Bumblebee does.

My bad, I had two of the loops mixed up, a 00R-f6 on the snow melt secondary with  grundfos 15-58 for the heating secondary on low. Had a 00 series I picked up somewhere and it was noisy right off the get go on the heating secondary, if I recall correctly I took the 00R apart and had to clean it as it was noisy as well with days of starting up, both Taco’s were used albeit very little before I installed them. The 00 got relegated to only if absolutely needed hopefully never spare pump.

[RSI]

What is the delta T pump? They didn't make a 00R delta T did they?