I'm back to the 'high mass, small boiler' issue that I've had since the install.
I'm looking to run water through the radiators 24/7, and was wondering if you thought that this would be an issue with such a small boiler. I can't imagine why it would be, given that I wire in some motorized mixing valves on the returns that are also tied into the reset.
It looks to be another busy spring and summer...
If you don't mind keep in touch with us over the summer. We will be traveling around to the dealers and if we end up in your area I would like to see the setup if you try it.
Dave, that sounds like a great idea. I can take a day off and give you the full tour...including the attack terrier.
Let me update you with my most recent findings, and perform a mea culpa at the same time.
My original idea with the boiler when I repiped it last year was to use the old boiler as mass storage to prevent thermal shock to the new boiler by heating ~52 gallons of water instead of just 12. Well, that might have worked if I had it plumbed correctly, but because I was getting primary flow through the indirect at the same time as I was trying to flow through the old boiler, and becuase I returned the zones after the old boiler, it never really did what I had hoped.
What was really killing me, however, was the low output I seemed to be getting from the boiler during the really cold days. I was losing 5 degrees in both zones some days, and it seemed like the boiler just wouldn't keep up.
What I found was that the combined mass would run all the way down to ~130f when the upstairs zone called for heat. Then, I would have to reheat all that water back up to the LL in order to get the downstairs zone satisfied for it's heat call. By the time the boiler reached the LL again, the upstairs was usually calling for heat again.
So, once I figured out that I had that issue going on, I bypassed the old boiler loop and ran the primary through the indirect and through my summer bypass. Based on the results last nite, this is how I should have been running the boiler all along, as the temperature in the house never fell below 70 upstairs or down. The recovery rate of the WL 110 is phenomenel, and it was able to easily keep up with both zones and used a lot less coal doing so. (of course, changing the fan and clearing the stack weren't insignificant modifications
All that said, because I am still working with a 12 gallon HWS and I'm heating the house with ~75 gallons of water total, I do believe my best long term solution for both boiler longevity and comfort will be setting up an ODR with a tie in to some mixing valves (I also have two variable speed pumps that I can throw in the mix) to allow me to run the radiators constantly, instead of banging them on and off. I run the primary loop full time anyway, setting up the system to divert the water to the zones as well seems to be a no-brainer.
I do still have an issue with the coal jamming up in the middle of the grate, which has a crack in it. I have no idea if the two issues are related or if this is still a function of the coal source ( I do get clinkers) but that will have to be addressed also.
Let me know when you might come down and I'll place an order for an easy cleanout and a new grate. That way I'll save shipping (don't tell Matt, he charges me when he delivers....