Replace B&G 100 or use Taco 007 monoflo

monoflobill

My 35 year old b&g circulator needs replacing do to oil leaks. Any opinions on proper replacement model given these specs. Gas caste iron boiler gross output 105K with 2 gallon capacity,100 foot rectangular run of 1 inch iron pipe with 1/2 diverter pipes, monoflo tees on both sides of each radiator.
Five 1940's caste iron 4 tube radiators all about 30" high and of varying lengths with approx. 30,000 btu of total output.
Sa-1 ell shaped flo check valve. Once radiators heat up the temperature differential is about 20 degrees. Would prefer to use taco 007 due to cost and no maintenance. Any thoughts?

JohnNY

The 007 isn't the best direct replacement for a B&G 100 in terms of flow rates, though it may be the best match for your system.
The 0010's curve is closest to the 100 and even exceeds flow just a bit. It may be overkill. I really can't tell from here, but these are the specs.

Gordy

Is it a B&G 100, or a 100 HV?

monoflobill

B&G 100

hot_rod

If the 100 has been covering the load, look for a similar curve.
With that boiler size you probably only need to move 8-9 gpm.

The B&G Vario is a nice option, you can dial it in to just about and system requirement.
Save electricity, and maybe get an energy rebate?

Gordy

Things are a bit different with a monoflo type delivery system. The OP states with present setup his delta is 20 when everything is heated up. If you drop that flow rate to much could cause flow issues for purging, and a very wide delta.

Paul48

From what the OP says, it suggests approx. 8ft/hd and approx. 8 gpm. He may have been dancing near shutoff head for the 100. The 007 may work, but it's a little too close for my liking. I'd probably go with the 0010, and put a globe valve on the return, to dial the flow in. That's my unprofessional opinion.

Paul48

You're right.......I calculated the flow based on boiler output, but as they say in Maine, ya still, "can't get there from here".

Paul48

I just re-read the original post........You're changing a series 100 due to oil leaks????

Gordy

I think the op is looking for a maintenance free circ Paul.

Paul48

When would you recommend he install that Gordy?

Gordy

?

Paul48

He wants to replace it because of oil leaks. Waiting until spring is probably wise, no?

Gordy

Sure. Or just wait until the spring coupler breaks because the excessive oiling has eaten the mounts, and shifted the alignment of the shaft. Usually when it's -10, and 1 am. Its 35 years old. That's pretty damn good on a three piece circ.

Paul48

You must spend a fortune on tires that might go flat.

Gordy

Only when they are bald, cracked, and driving a long trip

Paul48

Here is a quote from Heather from 2008. Over oiling is a common problem with these circs.

"And please, for the love of all that is holy, do not over-oil. The how-to for oiling your pumps is found easily on the B&G public website. They really don't take all that much oil"

monoflobill

Seems like some disagreement on which circulator. l wound up ordering A taco 0010 -3 speed pump. More than i wanted to spend but it seems like almost direct replacement. I'll post what speed i wind up setting it to after testing. Thanks for your responses.