Gas Cooktop Measurements
Cooktop dimension & countertop opening measurements for buying or installing a cooktop
GAS COOK TOP & COUNTERTOP MEASUREMENTS - CONTENTS: step by step illustrated guide shows how to install a gas cooktop into a countertop. These step by step instructions show how to prepare the countertop opening, how to make gas & electrical connections, how to position and how to test the gas cooktop.
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Gas cooktop measurements:
This article shows how to measure for a cooktop installation into a kitchen countertop opening & lists the specific measurements you should make before buying any cooktop & measurements to make again before attempting to install a gas cooktop into a countertop.
By making all of the necessary measurements you can avoid buying a cooktop unit that doesn't fit. In addition to the countertop opening length and width there are depth and obstruction concerns to address.
This article series explains the steps in installing & testing gas appliances and includes a detailed procedure for converting from LP gas or "bottled gas" to natural gas or "piped in gas" at a building.
Measure Twice & Cut Once Before Ordering & Installing a Gas Cooktop
You will need a measuring tape and should have already used it to make triple sure that the new gas cook top will fit into the countertop opening. Measure the countertop opening length and width and the depth between the countertop surface and any obstructions below such as a built-in ovenb or other piping or cabinet components.
[Click to enlarge any image]
Preliminary or Old Cook Top Measurements for Ordering the New Cooktop
You may have made preliminary measurements of the exterior dimensions of an existing or already-installed cook top if you are replacing an old unit like the one shown here.
We measured the countertop opening width and depth and the depth of the insert portion of the existing cooktop (photo above left).
Watch out: when measuring for any countertop cooktop installation, you want to be sure not only that the new cooktop will fit into the countertop opening (and clear any obstructions) but also that its supporting lip that rests on the countertop surface will be adequate for support and to permit sealing against spills that might otherwise leak into the space below.
You may have made preliminary measurements of the countertop cutout opening by carefully lifting the existing cook-top up a bit without having fully disconnected it. This procedure is likely to be followed if you are making measurements to permit ordering a new gas cook top and thus want to keep using the old one until the new cook top arrives.
At above left we have lifted the old gas cooktop, a Jennair unit, partly out of its countertop to measure its depth. A question was whether the new countertop would be deeper and whether it might or might not have adequate vertical clearance space above a built-in oven installed below this countertop.
Watch out: you may find as I did that the preliminary measurements may have been good for ordering the new gas cooktop, but on removing the old one there may be some surprises such as intrusions into the below-counter space that make installation of the new cook top or its piping difficult.
At the left side of our photo of the existing Jennair gas cooktop above take a close look at that bit of plywood cabinetry extending into the cooktop cutout space. I didn't notice that little intrusion until - ick - making a test-fit of the new cooktop.
To be sure that the new cook top will fit into the existing countertop opening and space measure at least the following:
Countertop cutout dimensions vs. cooktop exposed surface dimensions: The countertop opening dimensions, length and width to be sure that the cooktop's finish surface will cover the edges of the opening and will have room for any manufacturer-recommended sealing gaskets between the underside of the cooktop lip and the countertop surface.
Countertop opening vertical and horizontal clearances within the cutout space: The cooktop body dimensions below its exposed surface (silver rectangle in our photo below) must fit within the countertop opening and must clear any obstructions or intrusions into the cutout space. We got into some serious trouble with this dimension as we will explain below.
Cooktop body vertical clearance to an oven installed below: If you are installing a gas cooktop into a countertop below which is open cabinet space, the installation is pretty easy: there will be plenty of room below the cooktop for gas piping, regulator, and clearances. But if as in our example you are installing a gas cooktop into a countertop above a built-in oven you may find that the vertical clearance between the bottom of the cook top's enclosure and the top surface of the oven below becomes important.
Cooktop insert body width & depth - this is the portion of the cooktop that has to fit into the opening and to clear not only the opening sides but the presence of anything installed below such as a built-in oven.
Cooktop gas piping and electrical wiring routing clearances: particularly if there is an oven installed or to be installed below the cooktop you will need to pay close attention to the piping decisions and routing for gas piping connections, placement of the regulator, and routing of the electrical power connection that will power the igniters for the cooktop.
The manufacturer may simply say use a street ell to provide a horizontal connection for a gas regulator and piping connections when the piping has to pass above an oven installed below, or to use vertical piping straight down from the cooktop if there is no oven below.
But we got into trouble with this recommendation as despite careful measurements we found that the gas cooktop piping connection plus street ell would not clear the top of the oven installed below.
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Questions & answers or comments about gas fuel conversions: LP or "bottled gas" to piped-in natural gas service.
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Bosch, "LP Gas Conversion Kit Installation Manual , NGM Gas Cooktops (NGM30, NGM50, NGM 56, NGM80, NGM86, NGMP65)", (2014), Bosch, 1901 Main St., Suite 600, Irvine CA 92614, Tel: 800-944-2904, Website: www.bosch-home.com
Bosch, "Gas Cooktops Use and Care Manual, NGM5055, NGM8055, NGM8065, NGMPO55, NGM5655, NGM8655, NGM8665, NGMP655", (11/13), Bosch, 1901 Main St., Suite 600, Irvine CA 92614, Tel: 800-944-2904, Website: www.bosch-home.com
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Rheem Corporation, "Conversion Instructions, Natural Gas to LP Gas", FaxBack 1506 These fuel conversion instructions are limited to Manufactured Housing products only. Retrived 4/28/14, original source: http://www.rheem.com/docs /FetchDocument.aspx?ID=1c3868ba-1cdc-4e3f-8aec-b7c7a4a1d137
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Thanks to reader E Leal for suggesting the addition of details about how to convert gas burning appliances from propane to natural gas or from natural gas to propane. 8/4/09
Thanks to reader JR for discussing LP and natural gas operating pressures and leak detection safety, October 2010.
Glenwood Range Company, Customer Service, 435 Park Ave., Delaware OH 43105, 614-363-1381, Glenwood-Sunray Service Center: 215-682-4211.
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