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I have a Takagi T-H3J-DV water heater in a domestic radiant heating application. I am getting the error code 391 (Air-fuel ratio rod failure). I have cleaned and replaced the sensor multiple times but the issue seems to come back intermittently. I did put the heater in diagnostic mode and was...

A couple days ago, my natural gas forced air furnace went out. The limit switch was tripping and once my CO detectors went off. Reading 36 ppm at the highest. I have left the furnace off while I figure out the next steps. Furnace specs: Model year 2009, 60,000 Btu/hr, 92 AFUE Bryant...

My father is installing an off-peak hydronic heating system for a pole barn. In order to utilize the off-peak program with the local utility they are requiring a backup heat source. I can understand this requirement in the primary residence however this is just a pole-barn which is already...

My father built a pole barn with in-floor hydronic heating. We are just now getting around to adding the heat source (7kw Electro industries Off-peak boiler). He is located in Minneapolis MN so the 99% design temperature is -9.4°F. We are looking to use a Cryo-tek 100 anti-freeze mixture...

I am looking to add an en suite bathroom to the second floor of our house. My question is, what is the best way to route the DWV down from the second floor? Currently there is a full bathroom on the second floor but it is located across the hall, about 15 feet away from the proposed en suite...

I have noticed that my house is dripping from the window vents on the exterior during these recent cold snaps (-10°F and colder) in Minnesota. Build: 2009 Location: Minneapolis MN Walls: 2x6 cellulose insulation Windows: Some kind of double pane HVAC: Forced air, natural gas. ERV. Whole...

I am refinishing my basement adding a 3/4 bath and laundry room. I am in MN and we adopted IPC 2012 this year so I need a backwater check since my basement is below the next upstream manhole. In order to make the backwater check valve accessible I am locating it in a utility closest. In my...