Marshall Excelsior MEGR-9984 2-Stage Automatic Regulator Review

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My RV (a Chalet A-frame trailer) came with a Marshall Gas Controls 254-00 regulator, which after 10 years was not doing a good job of regulating. Marshall Gas Controls (a different company than Marshall Excelsior) went out of business in December 2012 and the 254-00 regulator is no longer available. This MEGR-8884 regulator mounts and connects exactly as the old 254-00 regulator and appears to work very well!

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We installed an on demand water heater and were having issues with it cutting on and off. The original Marshall regulator would only allow 195,000 btu of gas, 10psi, and 11" water column. This units allows 235,000 btu of gas, 10 psi, and 11" water column. This unit resolved my issues and I now have continuous hot water, even when the range and heater are on.

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Replaced identical defective regulator (original less than two-years old) on my Keystone Alpine RV. After installation, there was minimal gas flow...not enough to light the furnace at altitude in Colorado. Suburban water heater flame was also minimal with yellow flame. Finally, lit stove burners: minimal flame on one, and unable to light more than one.

After consulting with local RV store and researching online reviews, it seems that these regulators are known to be unreliable. I've now installed a " Camco 59005 RV Propane Double-Stage Auto-Changeover Regulator" (also available on Amazon for less money)...this regulator works flawlessly even at altitude in CO--all appliances have plenty of pressure to operate simultaneously.

Honest reviews on Marshall Excelsior MEGR-9984 2-Stage Automatic Regulator

Product works preety much as advertised. I expected auto switchover when

one tank ran dry, not so. In my application level window is hard to see I had

to add a mirror.

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The megr-9984 is sold as a replacement for the 254-00. It is not.

The lever on the 254-00 points to the service tank. When the service tank is empty the indicator turns red and the regulator switches to the reserve tank. The user switches the lever to point to the reserve tank and it becomes the service tank. The empty tank can be removed and filled. This gives the user a full tank when the service tank is empty.

The service tank on the megr-9984 is on the left and the reserve is on the right. When the lever is pointed to the left, gas is taken from the service tank. When the service tank is empty, the indicator turns red and the regulator changes to the reserve tank. The user points the lever the lever to the right, fills the service tank and then points the lever to the left. This give the user an unknown quantity of reserve when the service tank is empty. The reserve tank will eventually be empty and provide no reserve. The only way to have a full reserve tank is to fill both tanks at the same time.