taco pump switch

RJ Rossi

RJ Rossi

i Currentley have a 1/12 hp 1725 rpm taco coupler motor, I have been given a taco 009 1/25 hp 3450 ans was wondering if this motor is more efficient being there is no coupler to motor connection? @nd question is will this move the water too fast causing less heat transfer, I have a ranch home no basemnet, sio the lift required is minimal any help appreciated, Thanks in advance

Brad White_25

First of all

I would have to know your heat loss to establish what the appropriate flow rate would be.

That said, the 009 is a rather high head pump (more pressure than flow is another way to put it). The "curve" is steep, meaning that there is little flow rate range compared to a large pressure range. The 009 might be more suitable for a solar heating system or one where there is a lot of small-diameter tubing and a low flow rate.

Hypothetical Alert!:
Say your heat loss is, oh, 60,000 BTU's per hour and your water returns 20 degrees cooler than supplied. You would need to flow 6 gallons per minute (GPM). The 009 could do that against a pressure equivalent of about 17 feet of head (column of water 17 feet high). That is about two to three times the pressure drop what a "typical" home heating circuit might be.

A better choice (again, depending on what your heat loss/flow rate is) might be the 007, a workhorse and a common "default" selection for the average single family home. The 007 will deliver, by comparison, the 6 GPM against about 8 feet of head. Much more in-line I would think.

Bottom line on your efficiency question is, all things being equal (delivered flow versus pressure) the smallest horsepower or wattage consumed, wins! And these pumps cost less than $100 generally.

I would think a bit before I changed it out "just because". The difference between them is about 30 watts or about 1/3rd of a penny per hour of operation. Yes it adds up, but having a 007 as a spare is a good idea.

Minor point on "lift". This does not apply to closed heating systems. What goes up in the supply pipe is balanced by what is coming down the return. Think of a ferris wheel.