Joined on April 20, 2013
Last Post on February 24, 2014
@ February 24, 2014 10:50 AM in The best Delta T for a mod-con?If the boiler pump is set to a lower GPM than the system pump, that would keep the return temp low, but is there a drawback to this?
@ February 24, 2014 10:34 AM in The best Delta T for a mod-con?Low loss header, one pump on the primary flow, another pump on the secondary flow. To achieve the highest efficiency, should the two pumps (3-speed) be set at the same flow rate or different?
@ February 18, 2014 3:44 PM in Which of these two setbacks is more economical?This is some deep stuff.
@ February 17, 2014 2:25 PM in Which of these two setbacks is more economical?I am in zone 5A. So it does seem more complicated than I thought. It's a 20+ year old house, walls are 4'' (R13 fiberglass), attic has about R50 of cellulose. By the way, I do prefer sleeping in a slightly cooler temp (about 3 degrees cooler), so that's why I asked if I should drop the 3 on thermostat or the Vitotrol (heating curve)?
@ February 16, 2014 3:10 PM in Which of these two setbacks is more economical?I thought that if I could lower the return temp by a few degrees by decreasing the curve then it would make boiler condense even more efficiently.
@ February 16, 2014 7:14 AM in Which of these two setbacks is more economical?Like what the title says, one is to setback the heating curve by 3 degrees at night and keep the thermostat constant, the other one is to set the thermostat by 3 degrees while keeping the heating curve constant. I have all baseboard heating, boiler is Vitoden 200 with outdoor reset function, and Vitotrols which will give boiler an indoor temp feedback. Thanks!
@ December 13, 2013 1:44 PM in Low-Loss Header: am I understanding this correctly?The comm. supply temp is around 108-120F, so the boiler is in condensing mode.
As to the pump setting, you were saying it didn't whether the two pumps are both in med or one in med the other in low, did I understand it correctly?
@ December 12, 2013 8:39 PM in Low-Loss Header: am I understanding this correctly?Is it better to keep the Grundfos on both the primary and secondary loop to the same setting such as Med, or do you set the boiler pump to Lo and system pump to Med to further minimize the return temp? By the way, is there a way to monitor the temperature sensor inside the Viessmann LLH?
@ November 19, 2013 10:17 PM in Any way to extract more heat from the exhaust?The exhaust flue of my condensing boiler goes through an insulated (not heated) laundry room in my garage before exits the house, the flue feels warm to the touch and has kept the room a couple of degrees warmer than the rest of the garage (the room actually doesn't need to be comfortably warm, I just need to keep the pipes from freezing during the coldest nights here in NY). I know this has already been done by the condensing boiler but can more heat be left in that room before existing? By the way I was inspired by noticing the fins on the baseboard heater the other day. lol!
@ October 28, 2013 9:31 AM in outdoor reset and thermostat setbackI spent last Sunday doing air seals on windows, floors and electrical boxes, and the room felt a lot better now.
Any thoughts on my first question?
@ October 27, 2013 11:08 PM in outdoor reset and thermostat setbackBoth the boiler (shift of the heating curve) and thermostat are set back to the same temp.
@ October 26, 2013 9:03 PM in outdoor reset and thermostat setbackI am not sure if this info can be found in the boiler display option, how is it found normally?
@ October 26, 2013 8:30 PM in outdoor reset and thermostat setbackHow do I find out the delta T?
@ October 26, 2013 7:14 PM in outdoor reset and thermostat setbackI have a Viessmann 200 that uses outdoor reset to modulate the boiler, usually there is nobody at home 13-14 hours a day for six days a week. Thermostats are programmed to 68 when no one is at home, then 71 just before I come home at night. I understand that a bigger setback often goes against the outdoor reset, but for 13-14 hours away time would a bigger setback be justified in saving fuel or should I just leave it the way it is now?
My second question is regarding the heating curve of this boiler. My bedroom is a separate zone and I set the night time temp to 68 and 71 in the morning, in reality the room temperature struggles to reach 70 (sometimes only reaches 69) after 90 minutes of preheating. I could solve it by either increasing the "slope" or "shift" on the heating curve, but I want to know which one should be adjusted first.
@ July 6, 2013 1:09 PM in Viessmann Vitodens 100 vs 200?If I want to put a 200 in my house, do you think it's worth waiting for the new 200 in terms of both price and functionality?
@ July 6, 2013 12:16 PM in Viessmann Vitodens 100 vs 200?http://www.viessmann-us.com/en/Residential/Products/gas/Vitodens_200_B2HA.html
That's the new 200 you talked about right?
@ July 4, 2013 12:23 AM in Viessmann Vitodens 100 vs 200?Is that the one with a built-in 26 gal indirect?
@ July 2, 2013 2:11 PM in Viessmann Vitodens 100 vs 200?The boiler will run on LP. I don't know how it compares to NG in terms of gas quality, but do you think the Lamda Pro can take advantage of LP?
@ July 2, 2013 2:04 PM in Viessmann Vitodens 100 vs 200?My house has 3-zone baseboard heating. When you said "2 temps", do you mean one temperature of hot water for one zone and a different temperature for another zone?
@ July 2, 2013 9:54 AM in Viessmann Vitodens 100 vs 200?Could someone tell me in detail what's the difference between the 100 and 200? The price difference between the two is around $1k-2k. Both have ~95% efficiency, but does that assume the 100 can achieve that efficiency with a stable gas quality while the 200 can achieve that even when the gas quality fluctuates because of the Lamda pro?
I am wondering if it's worth paying more for the 200. Thanks!
@ May 19, 2013 9:23 PM in Longest lasting indirectsNot to jack the thread but which indirect has the lowest standby loss?
@ May 6, 2013 4:50 PM in What's the proper order for oil to gas conversion?Eventually I will get a contractor to calculate the loss. As for now, pray that they will approve my mortgage.