DaveG
New Member
Long time reader, first time posting. We are in the process of building a 3,300 SQFT 4 bedroom, 3 bath house just outside of Buffalo, New York. I am working on designing my hydronic heating system with primary and secondary loops and have several challenges that I am looking for general guidance from the forum.
The house will be heated with in floor radiant. Basement concrete has 1/2” PEX in floor tubing, 1/2” PEX with 1.5” gypsum pour over first floor, and joist track for second floor, and 1,000 sqft garage design temp 60F to take the edge off. Total Radiant load for entire 7,633 ft per manual J is a modest 54,000 BTUs with 20 degrees delta and 110 water design temp. 9 gpm total flow and 5.1 ft of head. This is broken down into 7 zones. Was originally leaning towards pumps, but could also use Zone valves for this low temp radiant circuits.
Where it gets more complex is we decided to add 750 sqft of total snowmelt in 3 concrete exterior slabs 3/4" tube 9" centers. Design temp 148F with a flow of 12 GPM and a design load of 140,000 BTUs
There will also be an in ground pool and we are exploring using our condensing boiler (idle in summer) as the primary heat source for the pool. For a proposed 23,000 gallon pool, the general rule of thumb would be a 250k BTU heater. We will utilize a titanium steel and tube heat exchanger and a separate loop (1" or 1-1/4") off of the secondary piping to continuously heat the pool.
My main questions are, knowing all these demands, what combination of Boiler(s), Pumps, Valves, would everyone recommend? Also need to consider DWH. I have used Combi Units with small radiant systems before but would really like some guidance and recommendations. I am a big Navien fan and would like to stick with their solutions. Thank you all in advance!
The house will be heated with in floor radiant. Basement concrete has 1/2” PEX in floor tubing, 1/2” PEX with 1.5” gypsum pour over first floor, and joist track for second floor, and 1,000 sqft garage design temp 60F to take the edge off. Total Radiant load for entire 7,633 ft per manual J is a modest 54,000 BTUs with 20 degrees delta and 110 water design temp. 9 gpm total flow and 5.1 ft of head. This is broken down into 7 zones. Was originally leaning towards pumps, but could also use Zone valves for this low temp radiant circuits.
Where it gets more complex is we decided to add 750 sqft of total snowmelt in 3 concrete exterior slabs 3/4" tube 9" centers. Design temp 148F with a flow of 12 GPM and a design load of 140,000 BTUs
There will also be an in ground pool and we are exploring using our condensing boiler (idle in summer) as the primary heat source for the pool. For a proposed 23,000 gallon pool, the general rule of thumb would be a 250k BTU heater. We will utilize a titanium steel and tube heat exchanger and a separate loop (1" or 1-1/4") off of the secondary piping to continuously heat the pool.
My main questions are, knowing all these demands, what combination of Boiler(s), Pumps, Valves, would everyone recommend? Also need to consider DWH. I have used Combi Units with small radiant systems before but would really like some guidance and recommendations. I am a big Navien fan and would like to stick with their solutions. Thank you all in advance!
