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Can i adjust a flow sensor on a instantaneous hot water service

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No, what do you want to achieve? Hotter water or turn on at a lower flow? The flow shitches are are either weighted switches or resistors, depending upon who makes it.

Posted on Sep 15, 2008

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Water heater


Most instant-on tankless water heaters require at least 10 psi of water pressure to start the heating process. The flow of water determines how hot the water will be, within the heating range. An electric 110 volts heater will increase the water temperature about 25 degrees F. A gas water heater will increase the water temperature about 45 degrees F.
Too much flow will not allow the water time to heat. Too little flow will not allow the heating system to work. Each heater must have the outflow water flow adjusted for the best heating outcomes. The best way to find the ideal flow is to turn the hot water facet on and adjust it (open or close) until the water reaches the balance of producing hot water.

Apr 25, 2016 | Water Water Heaters

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On our AE125, the thermal cut-off is tripping AFTER the water is turned off. The heating element is getting so hot you cannot touch it


The elements are getting over heated then set temperature.You have a defective thermostat. The elements will continue to heat until they reach the set point of the thermostat. Try to lower the temp setting first. If that does not fix it, you'll need to repalce the thermostat, located very near the element, under the screwed cover on the side of the tank.------------- To know how this heater works, read as follows:---

Because electric tankless water heaters have to instantaneously raise the temperature of incoming water to a selected hot water temperature, they require very powerful heating elements. To power the heating elements of this 27,000 Watt model, you will need to upgrade the electrical service you were using for your storage tank water heater. The PowerStar AE125 will require a 240V, 200 Amp service. In addition you will need to install three 40 amp dedicated double pole breakers in your electrical box. In Canada, you will require one 120 Amp breaker.

The PowerStar AE125 electric tankless water heater incorporates a very sensitive flow sensor, and three heating elements. The heat from the electric elements is electronically modulated on the basis of the flow rate of the water entering the water heater, and the temperature rise that the water heater must achieve. Through its electronic modulation system, the AE125 maintains a very precise hot water temperature. As a safety precaution, each of the three heating modules is protected by an electro-mechanical thermal cut-out. This device will cut power to a particular module if the temperature gets too hot.

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This will help.Thanks.Helpmech.

Jul 02, 2011 | Heating & Cooling

1 Answer

I have a instantaneous water system 10H Hydropower ...did not get a manual when installed....I need to have hotter water as it's winter and the water is like warm...not sure what to adjust...opened...


take the cover off the 10 h unit light up the burner by turning on the tap turn the water flow tap on the front of unit (white knob) clock wise slowly feel hot water pipe coming out off unit when temp increases put cover back on check temp at sink if too hot turn knob anti clock wise

May 23, 2011 | Bosch Water Heaters

1 Answer

I have a Rinnai Continuum Model 2532 natural gas tankless water heater in my home. It takes about 45 - 60 seconds for the water to get hot at the faucet which is closes to the heater. This thing is...


clean filter on the cold side coming in and clean or replace the aerator at the sink, rinnai works on water flow, common problem if your water hardness to high or if you have iron in your water

Oct 04, 2010 | Rinnai Webstone The isolator EXP tankless...

2 Answers

After water to house was shut off, my Noritz tankless water heater is on but won't produce hot water. On the unit, the light indicating that the burner is on stays off now.


you probably had debris get into the filter or flow sensor when the water was turned back on. I'd recommend checking the filter first and if that doesn't work, call Noritz Tech support to help you with the flow sensor.

the filter is a black plug located on the cold water line (labeled cold on the bottom of the unit). It points torwards the left.

Apr 14, 2010 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

2 Answers

Runs out of hot water


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.

Mar 11, 2009 | Rinnai Water Heaters

3 Answers

Water is either hot or cold - no in between.


I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

Nov 28, 2008 | Water Heaters

2 Answers

Bosch TF 250 hot water service, can not get the pilot light to stay on...


thre is a sensor thaat goes from the gas valve to the pilot that is called a themocouple change that and you will have no more problem

May 26, 2008 | Heating & Cooling

2 Answers

Error code F24


I see the same problem and now that I know it's a water temp sensor, I really don't have a problem. Living in Houston it get's so hot the cold water is hot coming through the pipes. I didn't have this error 24 until summer...

Nov 18, 2007 | Kenmore 46462 Front Load Washer

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