Laddomat Pump Replacement

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McKraut

Feeling the Heat
Sep 1, 2011
349
South Central PA
I am trying to get the boiler up and running for the season. I had a very late start because of some other projects on the farm. When I first fired up the boiler, I noticed that the circulator wasn't, well, circulating. I pulled it off the Laddomat to verify that it wasn't stuck, which it wasn't. After researching on a few other forums, I read that it is the pump, not the capacitor, that has gone bad.
I am looking for a replacement circulator for the Laddomat. The pump is a WILO RS25/7-3-P. I have read some older posts and I know this will be difficult to find. I have not found it anywhere in the US and have only found 1 location on the internet that sells it. That is in England and with shipping it will cost about $360. I have reached out to several supply companies, WILO, Termovent, and individuals and have a received only a few replies, but no possibilities. For that cost for a pump, I am considering taking out he Laddomat and replacing it with a Caleffi, but that is my last choice.
Does anyone know where I can get this pump? If I can't get this exact model, are there any other WILO pumps that will perform as the original. I would be willing to switch from 240V to 120V if needed. I listed the specs at the end of the post.

Thank you for any help offered!
Bob

Star-RS 25/7

Data sheet

Materials

  • Shaft
1.4034, X46Cr13

  • Pump housing
5.1300, EN-GJL-200

  • Impeller
PP-GF40

  • Bearing material
Total carbon

Operating data

  • Max. fluid temperature T
110 Celsius

  • Min. fluid temperature T
-10 Celsius

  • Maximum operating pressure p
10 bar

Motor data

  • Emitted interference
EN 61000-6-3

  • Interference resistance
EN 61000-6-2

  • Mains connection
1~230 V, 50 Hz

  • Power consumption P1(Q=max.) of selected impeller * number of pumps P1
147 W

  • Max. speed
2700 rpm

  • 0.6 A
  • Protection class motor
IP44

Installation dimensions

  • Pipe connection on the suction side
G 1½

  • Port-to-port length l0
180 mm

Information on placed orders

  • Net weight, approx. m
2.80 kg

  • Brand
Wilo

  • Product description
Star-RS 25/7

  • Article number
4037310
 
I'm wondering what you ended up figuring out about a motor replacement for your laddo.laddomat?

Ty,

Erin