jpen1 wrote: REPEAT THERE IS NO NEED FOR A DUMP ZONE ON A PRESSURIZED COAL FIRED BOILER.
I think you saying there is no need for a dump zone is like saying there is not need for a carbon monoxide detector. Of course if you monitor your draft ans make sure everything is running well, then you'll never need one in the sense that you'll never leak carbon monoxide and it will never go off.
The point of a dump zone is a safety mechanism. Some of the boiler parts are rated to 240 degrees. Yes it has a pressure release, so the boiler won't explode, as well as an expansion tank, but that high of a temp of water running through the lines could cause damage to parts. Yes, your stove should never be dumping. If you are you need to make some adjustments.
Its not a design flaw, its just something you need to factor in with this type of heat.
CoalUserWannabe wrote:So if a dump zone is to take care of excess heat, and if that's normal for coal boilers ,then it's simply some imperfection with boiler design, I mean I don't think you would find dump zone provisions on natural gas boiler, or oil boiler or other non coal fuel boilers !
When natural gas / propane / oil reach the high limit they shut off. They produce no more heat. When a solid fuel boiler reaches the high limit, it is still burning and can't be instantly shut off.
Of course there are probably fancy electronics and things you could add to your stove, but the thing that I like about the LL stoves are they are simple. I've read other posts where people need to replace this and that sensor, and multiple combustion fans and such. The more you add to a stove, the more it costs originally and in upkeep.