Gas supply for tankless hot water?
Question:How can I tell if I have enough natural gas available to run a tankless hot water heater. I already have two furnaces and a gas dryer. What would happen if my demand exceeds my supply?
Answers:
You have no worry on supply as the line coming to your house is high pressure that's why you have a regulator at the meter to lower the pressure, If your worried about starving the gas to your other units just put a T in the supply line off the meter, the size will depend on the BTU and length of run to the new unit. Installing your own pipe is no problem as you can get the pipe cut and threaded at your local hardware, make sure you use a good Teflon pipe dope on all your fittings and at the unit a good valve.
In my area the *code is 3 appl. per. meter.
Seems the meter is also a pressure regulator and one can excede it's supply cap.
the tankless hot water heater is based on BTU,and also the pressure that it needs at the gas valve natural gas units use 3,5 lbs of gas, in natural gas you should have about 6 lbs of pressure per square feet,with propane it should be 11lbs water column,by trade name.also from the main to the tank less hot water heater they require how many feet is it from the incoming line,if its thirty feet you could use 3/4 black pipe,and drop to 1/2 inch at gas valve.when you look at the BTU required it should tell you how far and what size pipe you need, to install it,if you are not familiar with gas leave it to the pros,gas is very dangerous, don't assume because you have two boilers and a gas dryer that that's enough,that's why they have codes and different pressures on pipes.
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