Asking again

Memoose

Ok I just got a gas boiler to replace my oil boiler. It’s a Westinghouse wbrc140 It has a internal circulator on the supply side. I added a few more baseboard radiators in the second floor considering it never had heat. Alas here is my issue, it’s a mono flow system,to start. The heat does flow to the second floor, it just seems to take a lot longer then I anticipated. Question is with the circulator on the supply side, may I, can I, should I, or not add a second circulator on the return side to help pump faster. I should add it’s all one zone up and down work on one t stat.

Brewbeer

Did it heat faster with the oil boiler ?

kcopp

How did you pipe it? it should be piped primary/ secondary.

Jamie Hall

Two pumps in series is a very poor idea. If you need more flow capacity, a bigger pump is a much better idea.

lchmb

I find the 008 works real good on monoflo. more gpm...how about a picture of the boiler to see how its piped? The other question, is it using out door reset and did the curve get set or is it factory?

MikeJ

Look at all the Geo pump packs that have two pumps in series.

JUGHNE

But there is not a boiler between them, would that be different?

DZoro

How long is " A lot longer". The second floor is the furthest away from the boiler, sometimes patience is ok.

Jamie Hall

I should be more precise. Two pumps in series is OK, provided they are properly matched. Likewise two pumps in parallel. However, if a system -- such as it might be a radiant piping set of loops -- needs a pump, the simplest and most reliable solution is one pump with the needed head and flow capabilities.

Without getting into a dissertation here, any pump installation must concern itself with the net absolute pressure at the inlet to the pump. If you have two pumps, one at the inlet to a pipe system and one at the outlet, there is a real risk that the one at the outlet may not have that pressure required, unless (in a heating system) that is the point of no pressure change.

There are too many possible configurations to give a general answer. However, the fundamental question is -- why bother? With the wide range of pumps available, surely one could find a single pump which matched the system.

The only time I have used two pumps in series -- and I have -- was in a situation where I simply could not find a single pump with adequate head. It was a slightly unusual situation; I needed to pump -- as I recall -- about 200 gpm up an elevation difference of about 3500 feet... that installation got an intermediate 15 stage turbine at the 1700 foot level installed in a surge tank.

Paul48

I'll repeat what was asked......how did you pipe the added baseboards?

Memoose

Using mono flow t’s I spliced the upstairs in the supply side. The current circulator pump is factory installed from Westinghouse.

Steamhead

That won't work. Too much pressure drop in the new zone.

Repipe it so the new zone has its own circulator and add a flow-check to each zone.

Maybe it's time to call a pro. Where are you located?