So, What's the word on the WM LGB series 3?

The Steam Whisperer

These look like a nice mid-efficiency steam boiler design, but our local supplier has stopped carrying them. Not sure if WM has stopped production or its just a local decision. Any experience good or bad?

EdTheHeaterMan

Still shows as a current available model on the Weil-McLain.com website.

Probably just a local supplier decision. Not selling enough of them to keep all the parts in stock.

OR

getting rid of series 2 stock before bringing the newer series 3 in as a stock item.

Looks like the ratings are about the same, but the color change in the jacket.

The Steam Whisperer

Getting rid of the atmospheric venting is probably good for a big jump in efficiency. Even a properly sized large atmospheric in a typical steam system is only running in the low/mid 60's seasonal efficiency. I would imagine the power vent design would bump that up significantly. Not in typical power burner range, and certainly not in a radiant burner/boiler set up, but probably quite a bump…probably low 70's seasonal efficiency. The typical oversized atmospheric steamer is running in the low to mid 50's efficiency.

Steamhead

https://forum.heatinghelp.com/discussion/comment/1811365#Comment_1811365

The problem is the extra moving parts. All moving parts are failure points. I would just install a stack damper on a Series 2 to keep it from cooling down so fast. Yes, the damper is a moving part, but a replacement motor isn't that expensive, and is easy to replace.

The Steam Whisperer

I wish they would put the stack damper directly above the heat exchanger, like on large tank water heaters, to lock in the heat.