Regulator to get the proper btu flow

[triplecrown]

I am installing a raypac 400k BTU pool heater
I have 2 psig natural gas supply and 10' of 3/4" pipe from regulator to the heater.
What make and model regulator can I use to get the proper btu flow?

the heater calls for 4" to 7" water col supply.
Thanks for any help.

Paul

 

[Bama Rambler]

Do a google search for 400,000 btu natural gas regulators.That should get you a make and model.