Has anyone measured the stratification in their Garn?
My sensor in the thermowell was telling me 144. If I positioned my thermistor about 10" over the well on the front face of the Garn I measured about 175. At the well, I measured 144. I was amazed that they agreed. About 30" below the well I measured about 123.
Water coming out of the Garn had my 2" pipe at about 128 or so. Circs were constantly running here. Last firing was about 10 hours previous to this.
The water outlet is about the same height as the well, I'll have to check the exact difference. But, the outlet feed certainly isn't at the very top of the unit, there's at least 10" of water over the top of the outlet....
I assume I'd just getting the water at the outlet level. Since the Garn doesn't take water off the true top of the unit, I'm not sure there's anything I can do about this.
Any other observations or comments?
I then started another fire. Interestingly, the water out the 2" feed line was up to about 149 yet the thermowell was staying at about 145 (It had dropped down to 139 in the meanwhile before I started the fire). I'm assuming that the turbulence in the tank is performing some mixing of the water as well as the fire introducing heat.
I'm finding that I can heat the house just lovely with the Garn, as my radiant is pleased as punch with just 120 degree water tops. That's the limit I have going into the floor at the moment. But, it is a hassle to heat the DHW as the Garn water at 120 will do it rather slowly. I dropped the DHW sensor down to 115, so it will shut off the DHW pump when the tank reaches 119. Still plenty of heat left for the floor, but its tough to do the DHW down at this level. Considering the idea of changing the DHW control to another unit and actually burning oil a bit just to fire the DHW if the boiler supply is less than say 130.
Thanks!
My sensor in the thermowell was telling me 144. If I positioned my thermistor about 10" over the well on the front face of the Garn I measured about 175. At the well, I measured 144. I was amazed that they agreed. About 30" below the well I measured about 123.
Water coming out of the Garn had my 2" pipe at about 128 or so. Circs were constantly running here. Last firing was about 10 hours previous to this.
The water outlet is about the same height as the well, I'll have to check the exact difference. But, the outlet feed certainly isn't at the very top of the unit, there's at least 10" of water over the top of the outlet....
I assume I'd just getting the water at the outlet level. Since the Garn doesn't take water off the true top of the unit, I'm not sure there's anything I can do about this.
Any other observations or comments?
I then started another fire. Interestingly, the water out the 2" feed line was up to about 149 yet the thermowell was staying at about 145 (It had dropped down to 139 in the meanwhile before I started the fire). I'm assuming that the turbulence in the tank is performing some mixing of the water as well as the fire introducing heat.
I'm finding that I can heat the house just lovely with the Garn, as my radiant is pleased as punch with just 120 degree water tops. That's the limit I have going into the floor at the moment. But, it is a hassle to heat the DHW as the Garn water at 120 will do it rather slowly. I dropped the DHW sensor down to 115, so it will shut off the DHW pump when the tank reaches 119. Still plenty of heat left for the floor, but its tough to do the DHW down at this level. Considering the idea of changing the DHW control to another unit and actually burning oil a bit just to fire the DHW if the boiler supply is less than say 130.
Thanks!