Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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- Posts: 2741
- Joined: Tue. Sep. 04, 2007 10:14 pm
- Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
- Coal Size/Type: Buckwheat/anthracite
- Location: Dalton, MA
I haven't run a 520, but based on making steam with a 700 stoker and a 900 boiler, I'd vote for the number of teeth that fills your radiators with steam (without building up a lot of pressure). However, I wouldn't go any higher than the number of teeth for which you can put in enough air to get an efficient burn. I think there are other threads here that tell you what the pot should look like. If you're burning rice that has a lot of undersized pieces, the fire my not "breathe" very well, and you may need a high air setting relative to the feed rate to burn efficiently (and may not be able to burn efficiently at high feed rates). I know EFM no longer recommends burning buck in a 520 (cue for whistlenut on that) but to make steam I'd suggest using at least "big" rice.