Greetings Yall,
I am working on a builder's personal home that will also be entered in the Home Builder Association's beauty contest in the fall, called the Parade of Homes. The house is extremely well insulated with R-30 walls, R-5+ windows, closed crawl space and encapsulated attic. The builder wants radiant floor heating on the main floor only. The conditioned floor area is about 2,600 sq. ft with a heat loss of 17,000 btuh on a design day. On the domestic water heating side, the master suite includes a "human car wash" large enough for a bible study group with four shower heads, + 3 more full baths. The challenge I face is how to match the heat loss and the domestic water heating loads with one natural gas appliance. After some thought and leaning on the opinions of several people smarter than me, the consensus was to forget it. That leaves me with two appliances, one for the micro heating load and the other for water heating.
For heating Im considering a modulating boiler such as Lochinvar, Knight or Cadet, or the Trinity Tx by NTI. Both turned down to 7K-8K input. The domestic water heating would be a condensing tankless style from the plumber as in a Navien or Rinnai.
Of course two gas appliances require two venting assemblies. Ideally, I would love to couple both appliances into a common vent/combustion air with only one roof-sidewall penetration. If the two appliances are the same manufacturer, that usually flies. My question is, does anyone know if the PVC venting of two appliances with different manufacturers can share a common venting scheme?
I am working on a builder's personal home that will also be entered in the Home Builder Association's beauty contest in the fall, called the Parade of Homes. The house is extremely well insulated with R-30 walls, R-5+ windows, closed crawl space and encapsulated attic. The builder wants radiant floor heating on the main floor only. The conditioned floor area is about 2,600 sq. ft with a heat loss of 17,000 btuh on a design day. On the domestic water heating side, the master suite includes a "human car wash" large enough for a bible study group with four shower heads, + 3 more full baths. The challenge I face is how to match the heat loss and the domestic water heating loads with one natural gas appliance. After some thought and leaning on the opinions of several people smarter than me, the consensus was to forget it. That leaves me with two appliances, one for the micro heating load and the other for water heating.
For heating Im considering a modulating boiler such as Lochinvar, Knight or Cadet, or the Trinity Tx by NTI. Both turned down to 7K-8K input. The domestic water heating would be a condensing tankless style from the plumber as in a Navien or Rinnai.
Of course two gas appliances require two venting assemblies. Ideally, I would love to couple both appliances into a common vent/combustion air with only one roof-sidewall penetration. If the two appliances are the same manufacturer, that usually flies. My question is, does anyone know if the PVC venting of two appliances with different manufacturers can share a common venting scheme?