drozwood90
Senior Member
I know this is not really home automation, but I have poked through Google and did not see any rule of thumb guides.
I found a nice chart to give me some numbers, but wanted to make sure I am interpreting the chart correctly...
Basically, we are building a new home. The builder insists that we only need 1/2" gas lines. In my LAST house, I installed a Tankless Gas unit, so I think I learned something. Based on the install charts (which are listed online)
http://www.boschhotwater.com/Portals/7/Tec...ish_10_2007.pdf
Page 19
(Side note, this was not my unit, but the chart is the same chart).
According to the distances that the builder gave me, I have about 55 feet of pipe from the meter to the furnace. Then another 10 to the water heater (for a total of 65 feet). Then another 42 feet to the gas line we are installing into the master bedroom for the fireplace...which is 107 feet.
I have normalized all the numbers to take into account drop distances (that is the water heater's 10 foot includes IT's 3 foot drop, but NOT the 3 foot drop from the furnace due to where it's T is located). I have also "guessed" at the number of 90s that will be used (as each 90 adds in ... I think it's 2 feet).
Since, they are ALL chained together (no branches, only taps along a long run), MY understanding is that you take the sum total of all the gas appliances that will be attached, and the FARTHEST point needs to be able to accommodate that amount of gas.
That, or you need to blend different sizes of pipe (as in 1" to the first appliance, 3/4" to the next, then 1/2" to the last). Which then the calculation gets more complex, but less costly...which I don't "get" as the cost difference between 1/2" and 1" pipe really isn't that MUCH...the nipples and Ts are more, but not THAT much.
So, am I crazy thinking that I need to have 1" lines? Based on the numbers that I have worked out, I need to have 138kBTU for my appliance, with capability for a LOT more (as a dead line I'm going to run will be for a GAS dryer (I use electric right now)) and I will be installing myself, a 55kBTU stove.
Did I get this out right?
Should I post all my detailed calculations??
--Dan
I found a nice chart to give me some numbers, but wanted to make sure I am interpreting the chart correctly...
Basically, we are building a new home. The builder insists that we only need 1/2" gas lines. In my LAST house, I installed a Tankless Gas unit, so I think I learned something. Based on the install charts (which are listed online)
http://www.boschhotwater.com/Portals/7/Tec...ish_10_2007.pdf
Page 19
(Side note, this was not my unit, but the chart is the same chart).
According to the distances that the builder gave me, I have about 55 feet of pipe from the meter to the furnace. Then another 10 to the water heater (for a total of 65 feet). Then another 42 feet to the gas line we are installing into the master bedroom for the fireplace...which is 107 feet.
I have normalized all the numbers to take into account drop distances (that is the water heater's 10 foot includes IT's 3 foot drop, but NOT the 3 foot drop from the furnace due to where it's T is located). I have also "guessed" at the number of 90s that will be used (as each 90 adds in ... I think it's 2 feet).
Since, they are ALL chained together (no branches, only taps along a long run), MY understanding is that you take the sum total of all the gas appliances that will be attached, and the FARTHEST point needs to be able to accommodate that amount of gas.
That, or you need to blend different sizes of pipe (as in 1" to the first appliance, 3/4" to the next, then 1/2" to the last). Which then the calculation gets more complex, but less costly...which I don't "get" as the cost difference between 1/2" and 1" pipe really isn't that MUCH...the nipples and Ts are more, but not THAT much.
So, am I crazy thinking that I need to have 1" lines? Based on the numbers that I have worked out, I need to have 138kBTU for my appliance, with capability for a LOT more (as a dead line I'm going to run will be for a GAS dryer (I use electric right now)) and I will be installing myself, a 55kBTU stove.
Did I get this out right?
Should I post all my detailed calculations??
--Dan