Do I need this regulator and a first-stage regulator to run my Cummins 20kw generator off of 2 25 gallon propane tanks?

You have to know what the incoming pressure has to be on your generator. If it’s between 9-13 water columns per inch. You just need this one. The first stage reduces the psi from the tank to 11-15 pounds per square inch. So check your generator incoming pressure.

can this be used on natural gas

As an expert in the field for over 4 decades,,,,, YES, you can use this for natural gas as long as you put an NG appliance regulator on the appliance. Not an issue since all new equipment comes with the appliance regulator. Or..... you can order the NG spring and change that. Both are easy fixes.

Horizontal mounting: can the top be rotated so that with the inlet at 3 o'clock and the outlet at 9 o'clock the vent will be down at 6 o'clock?

That would be fine, and is actually preferred. I’m almost all cases, the vent should be placed down or horizontally to prevent blockages such bugs, leaves, etc.

Will this regulator work with a 30,000 btu ventless lp heater? Also does it come with a mount?

Yes it will work with 30,000 lp ventless lp heater. I have one on my 30,000 ventless lp 5 brick heater and it is working great. I would recommend checking the inches of water column while heater is running wide open to make sure the regulator is supplying sufficient pressure (9-13" wc). The regulator does not come with mounting bracket,but it does come with the bolts to use for a mounting bracket

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🔒 Secure Your Gas Flow with Confidence!

SAFETY FIRST - Emergency inlet pressure rated at 50 psig.
ROBUST CAPACITY - Handles up to 1,400,000 BTU/hr effortlessly.
RELIABLE VENTING - Equipped with a 3/4 NPT screened vent.
PRECISION PERFORMANCE - Engineered for optimal pressure regulation.
VERSATILE COMPATIBILITY - Designed for 3/4" x 3/4" NPT connections.

The Emerson-Fisher LP-Gas Equipment R622-DFF 2nd Stage Regulator is a high-performance solution designed for efficient gas regulation. With a maximum inlet pressure of 10 psig and an emergency inlet pressure of 50 psig, it ensures safety and reliability. Capable of handling an impressive capacity of 1,400,000 BTU/hr, this regulator is perfect for various applications, featuring a versatile 3/4" x 3/4" NPT connection and a screened vent for optimal performance.

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