My heater does not get hot - Comfort Zone CZ7007 Oil Filled Electric Radiator Heater

You make sure reservoir is full if it's full after running 10 minutes or so check top and bottom radiator hoses and see if both are hot if only top one is hot may have a bad thermostat if both are hot it may have a heater control valve in heater line Goin into heater core

If both heater hoses are warm/hot,look under the dash at the heater core area and look for a air blender door lever.it may be disconnected .Or try to open it manually which should allow the air flowing through the hot heater core to enter the vehicle.

If only one hose is hot the heater core may be plugged internally.disconnect the heater hoses and back flush the heater back and forth with a garden hose until you get a unrestricted flow of water.

When disconnecting any heater hoses just clamp them off so you do not have to drain the complete system while working on "just" the heater.

No Hot Water - Electric Water Heater Troubleshooting

www.whirlpoolwaterheaters.com/owner-center/.../no-hot-water/

Whirlpool's video explaining potential reasons your water heater is not working ... Troubleshooting and Repair · No Hot Water (Video) · Replacing a Heating ...

Electric Water Heater Repair and Troubleshooting ' Whirlpool

www.whirlpoolwaterheaters.com/owner.../troubleshooting-repair/

Troubleshooting and Repair of a Standard Electric Water Heater. No Hot Water ... Not getting power is a common reason new water heaters don't work.

Troubleshooting Electric Water Heaters in MINUTES ~ Step ...

? 7:01
https://www.youtube.com/watch?v=SlyStHM9Nr0
Oct 4, 2013 - Uploaded by electronicsNmore
My tenant has a electric 30 gallon water tank. cimarron by Reheem. model ... So if u notice your water is overly hot and then notice no hot water ...

Could be a few problems causing this. Check to see if both heater hoses are hot going into and coming out of the heater core from under the hood. If both hoses are hot then there is an issue with the blend door/s inside the heater box assembly. If only 1 hose hot at the heater core and the other hose warm/cool you most likely have a heater core restriction and a back flush will be required. If no hoses are hot at the heater core then you have air in the system or the coolant level is low

Did you put hot to hot side? And cold to cold side?
Cold water pipe usually has shut-off valve.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#new

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1: not enough liquid in the system (air in the heater core)
2: inoperative heater valve not allowing hot liquid into the core
3: hot/cold blend door in the heater box stuck on cold
4: clogged heater core
A clogged heater core will have one hot hose and one significantly cooler hose at the firewall connection; easily tested by hand. a good core will have both hoses very hot to the touch when the heater is on full blast.
Make sure that the system is full and at operating temperature, and the heater controls set on full heat. Feel the hoses at the firewall; if they are both too hot to touch then the problem is in the heater box or controls.

check to see if there is plenty of antifreeze in radiator , may have a air bubble in system .

Possibly the heater core is 90% blocked. open enough to draw hot water in, (hose feels hot) but not enough volume to provide heat from very cold air, 10% hot water gets cold quick, coming from core..
Flush heater core in reverse direction - cold side in hot side out..

Just a theory..

Hello,

Based on gas prices, often gas hot water heaters can be a more cost-effective option than electric models and preferred by many homeowners. However, gas hot water heater models can have their own set of problems that differ from electric versions. You will not find it difficult to perform some basic troubleshooting to resolve an issue with a gas hot water heater.

Instructions

1. 1 Determine if the gas supply has been shut off. No gas will cause the hot water heater to stop producing hot water. Turning the gas supply back on should be your first troubleshooting technique.
   
2. 2 Check the pilot light. If you are experiencing no hot water, the pilot light of your gas hot water heater may have distinguished. Turn off the gas source and place a match over the pilot light tube to relight it.
   
3. 3 Adjust the thermostat of your hot water heater. If you find that the hot water runs out quickly or does not get hot enough, you may need to set the temperature of the gas hot water heater higher. Typically, set the dial between the medium and hot setting for adequate hot water.
   
4. 4 Inspect the gas hot water heater. The burner orifice and flue can both become clogged on a hot water heater. Turn off the gas and use a wire brush to clean out any debris that may have become lodged in these sections.
   
5. 5 Ensure that all the burner access covers are in place. If the pilot light will not stay lit, it could be due to exposure to drafts.
   
6. 6 Flush the tank. Certain deposits can build up over time when using a gas hot water heater which can cause the tank to produce a banging noise. To flush it, turn the heater off and open the pressure relief valve and drain valve on the water heater. Use a hose to flush water through the system until the hose runs clear.
   
7. 
   

Thanks.

3 minutes?? does the water run cold then? or just warm?
Is this what the tank you replaced was doing? If so, then you may have: 1 a recirculating pump instant hot water system thats faulty and allowing cold water backflow into hot water piping. 2 A tempering valve that has stuck, allowing cold water into your hot water system.
Or maybe a broken or missing dip tube in your new heater.
If after 3 minutes the water is coming cold out leave that faucet running and go to heater and feel the hot water outlet pipe from the heater. if that pipe is hot then the heater is not the problem. If the hot pipe from the heater is cold the heater is the problem. (Make sure the cold pipe coming into the heater is connected to the Right side marked "cold" !) If there is a tempering valve by the heater: feel the output from the tempering valve, if it is cold and the pipe from the heater to the tempering valve is hot, then the tempering valve is the problem. If all these are OK somewhere in your plumbing system hot and cold may be connected possibly a faucet or showerhead that is shut off at the spout/head, but hot/cold handles are left turned on then cold water can backflow thru hot pipe.