Kitchen Gas Appliances - Water Heater Question

I have a gas-fired 40 gallon Hot Water Heater that is about 14 years old. Problem is, whenever we take a shower the hot water runs out after like 10 minutes. The last minute or two of the shower is with the cold water completely off and the hot water completely on, and with that the water is barely warm. Our shower head is a new Waterpik Shower Massage, so I find it hard to believe it's flowing at 4 gallons per minute.

Is there something that could be causing a reduced flow of hot water, or is it possible to set the water level of a water heater so that it doesn't fill all the way? I haven't found anything like that on it though. Or is just a sign that the HWH needs replacing?

Thanks.

Hello: TheMoMo

Usually 1 of 4 potential problems exists.

The dip tube has holes in it or is broken.
The dip tube is an extension tube inserted into the cold warm inlet side. It allows the incoming water to exit at the bottom of the tank. In doing so it pushes the warmer water upwards and out the warm water side. The dip tube also allows the incoming cold water to exist very close to the thermostat control so it can be activated quickly.

Next item could be the thermostat temp control. Older tanks means older parts, which tend to react more slowly to temperature changes. The thermostat could be all or part of the problem but not as likely.

Next item could be too much sediment on the bottom of the tank. Too much reduces the heat transfer from the burner into the water. Tank flushing may help. Instructions for the correct way to accomplish the flushing task can be forund within the forum. Check other posted question on the topic or any on water heaters etc.

Foruth item could be the actual faucet the problem is occuring at. If the problem is isolate only at this faucet, suspect the faucet. If the problem exists at all faucets and or a washing machine, suspect the water heater.

At the ripe old age of 14 years, the water heat has seen it's better days and thus far provided it's better years of service. It may be time to consider a replacement.

If you need further assistance, use the REPLY button to add any additional information or questions, etc. Using this method also moves the topic back up to the top of the list automatically.

Regards & Good Luck
Gas Appliances Forum Moderator
Tom_Bart......Company Enterprises.....TCB4U2B2B
Energy Conservation Consultant & Natural Gas Appliance Diagnostics Technician.

Alway's consider the warranties and future service needs for any major appliances your considering to purchase. Price isn't always the best guide for long term appliance investments.

You could also have the thermostat temp set too low. Even though you are not siphoning off all 40 gallons, the incoming cold water could be lowering the whole tank temperature enough to make it uncomfortable.