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 What supply line to use for new dual-fuel range
Author: Murph (SC)

Hi and thanks in advance for any insights.

We recently purchased a Thermador range (Electric oven and 4 burner gas cooktop).
The max BTU's from the 4 burners on the new cooktop is 66,000
Our gas supply comes from an LP tank buried outside the home.
We run run heat, hot water and our cooktop with the LP.
The new appliance is intended to replace an existing 4 burner cooktop (and some old cabinets from below it).

The old cooktop had already been converted to LP when we bought the home.
The supply for the gas comes in through the cabinet to the right of where the new appliance will be installed.
That supply line has a shutoff valve in the cabinet.
The old cooktop was connected to the gas supply line with a 1/2 inch, 5ft long yellow flex line.

The new appliance has the gas hookup on the left side. It has a 3/4 in threaded male input and I have attached a 3/4 to 1/2 reducer on that to accept the 1/2 gas line.

Here is the problem.

The existing 5 ft yellow flex line is not long enough to from from the shutoff in the cabinet, down through the floor, across and up to where the new appliance gas line needs to be connected.

Based on my measure I need 8 ft from the shut off valve to the back of the appliance.

I have searched for longer flex lines but cannot find anything over 6 ft. Plus, I see recommendations that these be kept to a max of 1.5 meters.

The question I need answering is how do I make this connection? What material do I need to use and what special concerns do you all have based on what I have described?

I will have the gas supplier do a leak test when done.


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 Re: What supply line to use for new dual-fuel range
Author: steve (CA)

Have also read that those flexible gas supply connectors are not to run through floors or walls?

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 Re: What supply line to use for new dual-fuel range
Author: bernabeu (SC)


one may NOT, repeat NOT, run a flex appliance gas connector through a wall

it must be LOCAL and ACCESSIBLE


you either need a new range with the connection on the proper side for your application


you need to relocate the main gas line and local valve (which must ALSO be accessible LOCALLY)


"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

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 Re: What supply line to use for new dual-fuel range
Author: packy (MA)

if i understand this correctly, you can go back to the shut off, unscrew the flex connector and use a piece of 1/2 inch OD copper flared on both ends from the shut off to the stove.

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