Where to put pump?

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larryjbjr
Posts: 34
Joined: Mon Jun 12, 2017 7:17 pm
OWB brand: Johnson
OWB Model: Little John
Location: A bit north of Milwaukee WI

Where to put pump?

Post by larryjbjr » Sun Jul 02, 2017 4:40 pm

My outdoor wood boiler will be about 75 feet from my house. Is it better to put the pump on the boiler or in the house? And is it better to put it on the return or the supply side?


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Bull
Posts: 56
Joined: Sat Oct 29, 2016 9:18 pm
OWB brand: Central Boiler
OWB Model: 4436
Location: Southern Indiana

Re: Where to put pump?

Post by Bull » Sun Jul 02, 2017 9:03 pm

I believe it is better to put it on the supply side at the owb.

RSI
Posts: 297
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OWB brand: HeatMaster
OWB Model: G200
Location: South central Wisconsin
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Re: Where to put pump?

Post by RSI » Sun Jul 02, 2017 10:31 pm

If it is an open system (Johnson is) then it has to be on the supply side.
On the boiler is best but if I remember right, the access on Johnson boilers isn't the greatest so you may want to put it in the house.
If you do put it in the house, the pipe needs to supply enough flow by gravity to the pump that it never sees negative pressure at the pump inlet.

If you do not have that, the pump will not last very long.

larryjbjr
Posts: 34
Joined: Mon Jun 12, 2017 7:17 pm
OWB brand: Johnson
OWB Model: Little John
Location: A bit north of Milwaukee WI

Re: Where to put pump?

Post by larryjbjr » Tue Jul 04, 2017 7:56 am

RSI wrote:
Sun Jul 02, 2017 10:31 pm
If it is an open system (Johnson is) then it has to be on the supply side.
On the boiler is best but if I remember right, the access on Johnson boilers isn't the greatest so you may want to put it in the house.
If you do put it in the house, the pipe needs to supply enough flow by gravity to the pump that it never sees negative pressure at the pump inlet.

If you do not have that, the pump will not last very long.
You are right, there is very little room to put the pump at the boiler. The output is almost at the bottom of the boiler.

Now, my boiler output is about even, maybe a little lower, than my basement. But, the output is located at the bottom of the boiler. So, there is a lot of water above the level of the basement. I haven't been able to check it, but I assume that I would have plenty of gravity flow to the pump if it was placed in my basement.

So, would I be ok then to put the pump in the basement?

RSI
Posts: 297
Joined: Mon Jun 23, 2014 8:51 am
OWB brand: HeatMaster
OWB Model: G200
Location: South central Wisconsin
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Re: Where to put pump?

Post by RSI » Tue Jul 04, 2017 11:11 am

It will probably be fine. try to avoid any high spots between the boiler and pump. Air gets trapped in them and it very hard to remove on that side of the pump and can cause an air lock.

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