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I have a Bosch21e water heater problem is its not heating we had to switch over to a full gas bottle since then we have had no hot water any help would be great.

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Sounds like you have air in the line and needs to be bled out

Posted on Jan 27, 2009

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I've had this problem. 2000 GMC uses a closed coolant system. Meaning takes and returns coolant from and to the Reserve Bottle and has little air in the engine and heater systems.
If everything appears ok but no heat. "Air Lock" is the most likely cause. (With interior heater set to full heat) Solution; 1. Make sure water pump works. 2. Drain about 1/2 engine coolant into container. 3 Remove both heater hoses from engine side and flush heater core in both directs through heater hoses with garden hose. 4. Reattach heater hoses in correct locations. 4. Refill engine with coolant. 5 Start engine and run for 2 min., use caution when topping up coolant.
6. Most 2000 GMC have twist off caps with plugs located mid way on heater hoses. with engine cold, start engine these caps may be loosened to allow trapped air to escape. Do not attempt with engine hot due to hot coolant injuries. This may take more than one attempt to remove all air from heat system. 7. Lastly most 2000 GMC water pumps have a bleeder plug,( 3/8" square driver plug) located on the water pump. With egine cold this plug should be removed to remove any air. Reinstall plug with thread sealant.
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I have a Atwood 10 gallon electric/ propane water heater on the Hornet travel trailer I purchased used. There are two switches on the wall, one is an on/off switch that lights up and the oither is just an...


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How long does it take to reheat water when gas bottle runs out and then you switch to new bottle ?


water getting hot should be almost instant... it may take a minute to move the cold out of the pipes.
is your heater ignighting?
if not then you might have a small amount of air in the gas line when you changed the bottle.
you will need to bleed the line...

with the gas turned on, loosen the gas connection to the unit and let the air out until you smell gas.
tighten the connection, snug, do not over tighten.
wait about 5 minutes for the gas to dissipate before attempting to light the unit.
during this time, you can use a little soap water on the connection you loosened to make sure it is not leaking.

now go turn on your faucets, let the water run for a minute and make sure you get hot water.

if no hot water, then you might have something else wrong. you will need to let us know the error code and what the unit is doing

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We are getting luke warm water and the low gas alarm is sounding even though we have a full bottle of gas. My gas hob is working fine.


even though you have a full bottle it might not be the right bottle, you have to have a min 2lb for a water heater to work, take and have the bottle checked to make sure it is the right pressure tank

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