Greenwood 100 Again...

Could be too little flow on boiler side, or too much on the other side. If your temps are good on the load side when there's a load on, ya it's likely the boiler side. This is the tricky part of HX sizing & pumping determinations - and also when variable speed or multi-speed pumps come in handy. I like my variable load pump, and multi boiler pump. I don't have an HX, but would come in even handier if I did.

My GW never ran right until I ripped out the hex and ran the whole system together under pressure. Still has original skins after almost eight seasons. Your pump is also underpowered. Later GW systems had a flow switch and would shut down if there was not enough flow. Most people had to upgrade the pump just to get them to work. Just another classic GW blunder leading to their downfall. Too bad, because with some cheap fixes it is a really great boiler..

tigermaple said:

My GW never ran right until I ripped out the hex and ran the whole system together under pressure. Still has original skins after almost eight seasons. Your pump is also underpowered. Later GW systems had a flow switch and would shut down if there was not enough flow. Most people had to upgrade the pump just to get them to work. Just another classic GW blunder leading to their downfall. Too bad, because with some cheap fixes it is a really great boiler..

Click to expand...

What do you mean? Are you referring to "ripping out the flat plate HE that Greenwood always shows in the manual? I ask because I never used a flat plate, my GW100 ran directly into a 80 gallon Super Store from day one, I think that is why I have had few problems with cycling, creosote buildup, etc....Also my GW did not come with any external HX....I agree, it's a great design and has many advantages over the more popular gasifiers that everyone touts. I think the majority of the GW problems came from improper installs, and a total lack of quality and knowledgable technical support.

What are those design advantages?

maple1 said:

What are those design advantages?

Click to expand...

Allows me to load very large rounds, if I can fit it through the door, it goes in....this cuts down a lot on wood processing...The refractory box gets around 1700 Deg, after those temps are reached, I can throw just about Any kind of wood in, Green, Damp.....whatever, the temps will cool down a few Deg, then get right back up to 180 temp out. Lastly it's a very simple design, no controls, fans, flue gas maintanance, etc....when the GW/Seton design is wide open, it just burns hot, clean, and simple ....That's about it. I am sure the newer high tech gasifiers are fine, but to me they seem to be a bit more picky and finicky, unless of coarse you dot your I's and cross your Tees, when it comes to loading and running....

Yes, I was referring to the plate hex.