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What I learned....NEED HELP on radiant pump selection

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Posted by Eichler on June 24, 2006 at 14:19:57:

In Reply to: Which is better: Munchkin 140 vs. Weil-McLain Ultra 155 posted by Eichler on June 19, 2006 at 17:48:15:

What I learned...
NEED HELP on radiant pump selection

Reading several radiant heating forums and reviewing my particular installation requirements has taught me:

1) My 37 year old RayPak has respectable efficency, and only a condensing boiler would lower my heating costs.
2) Stainless steel or copper tube boilers would be better than cast iron of aluminum boilers.
3) There are enough negative comments on the Munchkin 140 to avoid this model.
4) The Lochinvar Knight 150 has both good owner reviews and a close physical match to my site requirements. The microprocessor control system may be overly complex for the required function.
4) The Traingle Tube Prestige 150 has both good owner reviews and is $1,000 cheaper than the Knight. Looks like a Best Buy. This wall mount design is not a good match for my site.

I plan to purchase the Lochinvar Knight 150 and hope the electronics lasts 40 years like my all old school Raypak.

I still need help selecting a stainless steel pump. ANY RECOMMENDATIONS ON HP, FLOW RATE, and HEAD? My current pump is a large 1/6 HP, but no other specs are available. My seat of the pants guess would be 1/6 HP, 35 GPM flow, and 35 head feet pressure. Grundfos UP26-116F or UP26-99F look close.


I need help!

2,250 sq.ft. 1969 Eichler home with 117K BTU inlet 97K BTU output natural gas Raypak boiler with a single 1/6 HP circulation motor driving 10 radiant concrete slab loops - one/room.

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