This grill is in a salt water environment - ocean less than 100 ft away.
The left knob to increase the heat has become very hard to turn. Coincidentally, when this happened, the flames will not go very high, on either side. We know there is fuel, but there is not enough heat to cook food.
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Re: Flame is too small, does not get hot enough.
This sounds like it probably is a regulator problem - they tend to corrode very quickly in salt environment - i live on the coast too and have the same problem often.
First thing to try is to spray a little WD40 or similar into the regulator. often they will have a tiny hole somewhere in the body of the regulator usually on the side away from the gas bottle but there are many different types - spray in this hole in particular. Then give the regulator a bit of gentle violence - often the spring plate inside can stick or the valve itself and this can free it up.
No luck with this then get a new regulator - they are not usually expensive - make sure the regulator is the correct type for the gas you are using, they have different pressure settings for propane, butane, and all the assorted mixes.
The sticky left Knob is unlikely to affect the gas flow, although there must be some corrosion to make it hard to turn so it is possible that this has gone into the valve/pipe behind the knob - sometimes these valves can be dismantled and cleaned fairly easily, some are sealed units that just have to be replaced - if you want to try and are not sure what to do, try posting back with some photos and i could try and talk you through it, or try getting me on a live chat armed with photos, some WD40 and a selection of basic tools and some steel wire wool (stainless if possible).
Hope this helps and we can get you grilling for the summer, please ask again if not :)
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Orange flame is not enough air in the gas air mix. You have a spider nest living in the venturi tube and nozzle. Weber sell a special brush. The venturi tube is between the gas control knob and jet and the burner.
Salt water motor has more stainless parts (vs steel or other metal that will corrode). They usually have better quality internal parts as well. The connections in the head unit will corrode over time from being in salt environment. If you will be in salt environment it is worth the increase in price.
This is usually a regulator problem, or a gas leak where the regulator line attaches to the back side of the knobs. Test for a gas leak first. You can use a mixture of water and liquid dish/hand soap. Saturate the area where the hose connection is, turn on the tank, but leave the knobs in the off position and do not hit the igniter. If there is a leak, you should see some bubbling where it is. If there is no leak, turn the tank off, open the valves (turn the grill knobs on) and bleed the gas out of the lines. Once it has sat for a few minutes with the knobs in the "high" position, turn them off. Then leave them off and turn on the tank, followed by one of the knobs and ignite the grill. see if the flame went away. I've seen this happen where there is not enough pressure in the line. Turning the tank off, the knobs on, bleeding the line, then closing the knobs and opening the tank and letting the gas build up pressure in the line before turning the knobs back on or trying to light the grill should resolve it.
Next time you use the grill turn the gas on slowly. For some unknown reason when turned on quickly the regulator reduces the gas flow.
Another problem with some gas fittings is an auto shutoff if detects the slightest leak. Sometimes the shutoff is not 100% and allows a small amount of gas causing the weak flame.