Best Of
Re: Need to make a decision ASAP!
Crown has changed their name to Velocity Boiler Works and is owned by US Boiler. I believe many of the Crown boiler castings are the same as the Burnham. I have known Crown to be an outstanding family owned boiler company from Philadelphia, since the purchase by US Boiler the Steingard family still holds a management position in the Philadelphia location. I would go with Crown over Burnham If I were to choose.
Regardless of the brand name of the boiler, I would go with the contractor that has the best reviews online, and with the contractor that is doing the proper measuring job to select the proper size boiler. The contractor is the bottom line in any HVAC decision.
I never liked Goodman Equipment and always thought that Lennox was the premium brand of equipment. That said , If a hack of an installer installed the Lennox and a true professional installed the Goodman, I would select the Goodman because the contractor is the more important choice.
Same with boilers and even more important with Steam Boilers
Re: Need to make a decision ASAP!
All the radiators need measured and the boiler size is developed from that. Either one measured and one didn't or neither measured.
If I was guessing, given it's one floor of a house, I'd speculate you want the smallest one available. So both of the ones suggested could be too big.
Without the radiator measurements it's literally like throwing darts at the wall, while blindfolded, after being spun in circles 20 times. Seriously.
We can help you calculate if you can get the height (from the floor) and width (in the front to back direction), and number of sections of each radiator, along with a picture of the end of each so we can see style. After that it should be fairly easy if they are relatively typical radiators.
Re: Flow too slow ?
Purged the system again, been running about four hours now.
Going in the manifold at 95* returning at 81*
Once things get to temperature I will likely lower that a bit.

Re: Bosch Greenstar 151 boiler for radiant heat system, not working consistently
The Bosch Greenstar 151 boiler is 199k btu's. All parts ARE working, because I have days when there is generally no issue, even first thing in the morning. I think that the issue is related to the zone valve (2nd pic) that was put in originally to send heat to the basement. It works off the same circulator pump that is used for the rest of the tiled floors. All of the tiled floors (entire 1st floor, basement, and 2 bathrooms on the 2nd floor) are getting hot water (hydronic radiant heat) via the same circulator pump.
This past Sunday, I would have sworn that the circulator had died - all of the afore-mentioned tiled floors were cold, as was the circulator, when I checked them ~7:30 am. The circulator for the bedrooms on the 2nd floor (bamboo floors) was working fine. When someone entered the basement from outside around 10:30am, letting cold air hit the basement thermostat, the circulator kicked on and sent hot water to all of the rooms that had been calling for heat for hours.
I need someone who really knows how the wiring in the Taco relay boxes should be, as well as how the settings for the Z-one Caleffi relay thing should be. Somewhere/ somehow, the messages from the 1st floor thermostats are going to the Viega actuators, but not getting to the circulator.
