Water Heaters - Recent Questions, Troubleshooting & Support


Shut off unit then turn off water to house at water main out side. Drain water heater remove old valve install new

Reliance Water... | Answered 8 hours ago


tank water heater? if so its because the water is much colder this time of year. water heater has to work harder to heat 40deg. water than 70deg. water in the summer. That also means as you use the hot water from the tank its replaced with very cold water. Causing you to have less hot water. Either get a larger water heater. Or even better go tankless and have never ending hot water and save money at the same time.

Rheem 50 GAL FVR... | Answered 8 hours ago


I wonder if you have this problem below caused by a drop in water pressure from someone flushing a toilet or a washing machine. I would call the company to remedy this issue.

17. What is a cold water sandwich effect? The term “cold water sandwich effect” is a term that is used to describe the introduction of cold water into the hot water supply line during frequent on/off operation of an instantaneous water heater. The cold water sandwich effect, when present, appears as a momentary drop in hot water temperature as it is discharged from a hot water supply outlet (i.e. shower, tub, or faucet). This phenomenon is present in the operation of all instantaneous, tankless style, water heaters, but is minimized with the high tech design of Rinnai water heaters.
The technology built into the Rinnai water heaters is designed to minimize the cold water sandwich effect. Rinnai water heaters are microprocessor controlled and when water flow through them ceases, they remain in a “ready to fire state” for approximately 1 minute. If water flow through a Rinnai water heater begins within the first minute following water flow stoppage, the water heater will fire back up within 1 to 2 seconds. This minimizes the cold water sandwich effect that would otherwise be experienced with a low tech tankless water heater. It should be noted that the cold water sandwich effect cannot be removed completely from tankless style water heaters. The safety standards developed to insure the safe operation of water heaters require a delay in the ignition sequence of all gas water heaters.
While the cold water sandwich effect cannot be completely eliminated from standard plumbing systems, it can be eliminated from plumbing systems that have a supply and return hot water circulating system. Rinnai has developed 2 methods to eliminate the cold water sandwich effect in residential hot water circulating systems.
The first (and preferred) method to remove the cold water sandwich from circulating systems utilizes a small electric tank water heater (powered up) that is used with a dual purpose. The small water heater acts as a mixing tank to eliminate the cold water sandwich effect from the Rinnai water heater and it uses its electric heating element to offset the heat losses from the hot water circulating system.
The second method to remove the cold water sandwich from circulating systems utilizes a small 2 to 6 gallon storage tank installed on the hot water outlet of the Rinnai water heater. This tank acts as a mixing tank to blend the cold water sandwich with hot water and eliminating its effect at fixtures.

Rinnai Water... | Answered 8 hours ago


we give advice only

Water Heaters | Answered 2 days ago


as with all water heaters they need flushed once in awhile to get rid of sediment in the bottom of the tank . knowing this from the get go most of us never seem to get around to doing it . even myself but I do have a unit that is supposed to prevent this by the dip tube that was built in has circular action in the bottom of the tank

Bosch Water... | Answered on Jan 20, 2019


I suggest you check the owner's instruction manual but it would be rare for any water heater to have a facility for reset - if they are ok they heat the water to the preset temperature and maintain that temperature and if they don't it is because there is a fault that, for safety reasons, should be rectified.

Rheem Water... | Answered on Jan 19, 2019


Check on the boiler. Should have adjustment to adjust water hotness

Water Water... | Answered on Jan 19, 2019


Also could be erratic flame sensor or igniter operation

Water Heaters | Answered on Jan 19, 2019


Attempting to replace the flutter valve is ambitious and may be a ticket to a more expensive repair. First you need to locate the valve and then decide if you have the tools and skill to attempt the job. I would look at the manufacturer's website for an exploded view of the water heater and then go to your water heater and check it out. You will need to seal the threads on the line the valve is attached to, so a trip to a plumbing shop or a hardware store is also in order. By the time you pay for the sealant and your time and effort in finding the part you may be money ahead to leave this to a pro. The only web references I could find for the name and model of your water heater were in Indonesian, so good luck finding English translations of their technical materials.

Water Water... | Answered on Jan 18, 2019


Look it up on the internet - use the model number to find a manual.

Water Water... | Answered on Jan 18, 2019


Try mounting on rubber standoffs. The mechanical timers are noisy and when mounted on a wall that amplifies the noisy.

As a test, un bolt it from the wall and see if noise is acceptable. If so, find a cushioned mount.

Intermatic WH40... | Answered on Jan 16, 2019


make sure the water supply linee is on,and water outlet line is open.,and unit is plugged in.
If all are...u got a bad unit.

Water Water... | Answered on Jan 15, 2019

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