CEC Power star

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Snyderslake

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My water heater doesn't turn on when a water filter is installed and turned on at that sink. If the filter is bypassed the hot water heater engages. The water heater also doesn't turn on in the shower when a showerhead is installed. It's like there is too much back pressure or restriction so water doesn't flow through the Power star fast enough to cause it to power on and heat the water. Is this a problem with the water heater or the bladder tank providing pressure to the whole house? The water pressure is 53 psi. Thanks for your expertise.
 

Fitter30

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Need the complete model. Heaters have a minimum flow filter just might have enough pressure drop which lowers flow lower than the minimum. What happens when both sink and shower are turned on? 5 gallon bucket filled by shower head time it for a minute measure how much water in the bucket. Is this a new heater? Bladder tank are u on a well?
 

Snyderslake

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Need the complete model. Heaters have a minimum flow filter just might have enough pressure drop which lowers flow lower than the minimum. What happens when both sink and shower are turned on? 5 gallon bucket filled by shower head time it for a minute measure how much water in the bucket. Is this a new heater? Bladder tank are u on a well?
The model number on the unit says 45-551301. I can't find anything else there or online other something about an ae125. CEC sold out to Bosch about 10 years ago. We just bought our hunting camp 2 months ago and this unit was in there so this is not new.

The house is on a well and there is a bladder tank.
 

jadnashua

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A tankless WH requires periodic maintenance. Hard water deposits will occur inside of the heater, and restrict the flow through it.

If you're lucky, it was installed with the needed fittings to do a descaling procedure on it. Generally, that needs to be done annually. Basically, you close it off from the rest of the system, then pump a weak acid through it for what might take a couple of hours until all of the deposits are dissolved, then flush that out, and restart the system.

If you don't have those fittings, you'll need to repipe it to put them in.

The mineral deposits not only restrict the flow, but act like an insulator, so it can't make as hot water. Keep in mind, a tankless system is sort of like passing your hand through a candle flame...do it slowly, you'll transfer a lot of heat and maybe burn yourself, but do it fast, and you'll not notice it at all. Then, compare it to a blowtorch versus a birthday candle.

The flow sensor might be all gummed up with mineral deposits, and isn't recording the fact there's any flow so it won't turn the thing on. That might get solved after descaling it, but that part might need to be replaced.
 
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