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Joined on February 2, 2013

Last Post on June 21, 2014

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Pump off

@ June 21, 2014 7:35 PM in Hot water first floor, luke warm water second floor

I have had the return off and the recirculate motor off for the last two day and no issue. I am going to assume it is the check value. Thanks for the help this board is awesome. Is this the check value ?


@ June 20, 2014 11:25 PM in Hot water first floor, luke warm water second floor

Is it possible that their is air in the system that is cause this issue? Would it benefiting I flushed the system?

Check valve

@ June 20, 2014 8:06 PM in Hot water first floor, luke warm water second floor

Is this the check valve


@ June 20, 2014 2:41 PM in Hot water first floor, luke warm water second floor

Quality work


@ June 20, 2014 12:29 PM in Hot water first floor, luke warm water second floor

Pic of the work,

Shut off

@ June 20, 2014 12:23 PM in Hot water first floor, luke warm water second floor

I did shutoff the return to the pump and so far I have hot water. I am going to check when I get back home.


@ June 20, 2014 10:17 AM in Hot water first floor, luke warm water second floor

That the weird thing nothing was changed in the plumbing system. The only reason I thought it can not be the navien system is because the first floor is getting hot water and the hot water pipe that feeds the first floor does branch off to the second floor where the aqua stat and return to the pump is installed.

What does not make sense is that one out of 10 times we get hot water upstairs, I can not explain that. Pump seems to be running, navien is running, DHW pipe is hot, pipe going to the second floor is warm and the return pipe is warm.

Normal operation is I expect the DHW pipe is hot, the pump off and pipe going to the second floor to be hot and the return to the pump to be cold.

Shut off the value on the return to the pump and shut down the pump motor, had hot water this morning, I will see how that goes.

temp reading

@ June 20, 2014 10:09 AM in Hot water first floor, luke warm water second floor

Yup the reading from the navien is 135, I have the temp set to 120, the facet downstairs measures 121.


@ June 19, 2014 9:47 PM in Hot water first floor, luke warm water second floor

Had the tech come out in the winter because of a clog intake, I just notice that I only shut down the motor on the circulator pump not the value on the return. I am going to try that for a day and see what happens. My thought is that the aqua stat temperature is set to high and is pulling the hot water back to the unit, The unit is not adjusting the temperature because the return is already hot, so the water getting returned to the shower is luke warm. Note I am not plumber so let me know if I am even close.


Hot water first floor, luke warm water second floor

@ June 19, 2014 9:07 PM in Hot water first floor, luke warm water second floor

I have one navien ch 240 with a circulating pump for the second floor about two weeks ago we got luke warm water upstairs and hot water down stairs. For the last two days it has been consistent where upstairs I only get luke warm water, once in a while I will shut down the circulating pump and then I get hot water. But ten minutes later luke warm water with the pump off. I am completely baffled on what the issue could be. This did not happen last year.


Like it

@ January 4, 2014 2:21 PM in Combi boiler dhw and heat or dhw or heat

So far no major complaints ( Knock on wood) the house is 2200 sq feet and 2.5 baths. Currently we have the DHW set at 120 and the heat to 180 with the unit running on low temp. I am tempted to switch the unit to high temp because when it gets single digits or below zero the system is always running and it hard to maintain the house at 72. Usually on a single digit day the house is at 68 with the temp set to 72. Single pane windows do not help and we use to have oil and we do not have enough base board and when I made the switch I did not note what the temp was set too. The only other issue is during the warmer months that we experience cold water sandwich. But that could be solved by installing the remote or switching the pre-heat switch. I prefer to save on the gas and let the water run a little Annoying sometimes it like half of a bathtub of water.

Combi boiler dhw and heat or dhw or heat

@ December 18, 2013 7:01 AM in Combi boiler dhw and heat or dhw or heat

Last night I noticed when my wife was washing the dishes with hot water and the dishwasher was running. I was downstairs the basement and I noticed that the supply temp drop down to hundred and 20° which is what the dwh is set too. I noticed that the pipes for the baseboard he became very cool even though the system was calling for heat. Once she shut off the hot water the supply temp jumped back up to hundred and 60 and the baseboard Became hot again. Is this normal does this systems only can do one task at a time they can't keep the house and generate hot water at the same time? The product is a Navien ch240a.



Like it

@ May 12, 2013 9:55 PM in Hot water recirculation do they save money?

So far I like the system I normally get hot water in about 5 to 15 seconds not sure that is good or bad the temp is around 90. The only annoying is at least once day I get a cold water sandwich and it takes at least 60 seconds for the unit to kick in, i am assuming the small storage tank would solve that as you mentioned. I have also heard people state that i could set preheat but that just bugs me to have the unit running during that that time especially if no one takes a shower at that time. What temp should the aquastat be set too? How much more money am I burning with this feature?



@ May 12, 2013 2:33 PM in Hot water recirculation do they save money?

Pump is on the left of the unit.

Hot water recirculation do they save money?

@ May 12, 2013 11:54 AM in Hot water recirculation do they save money?

I have done some research on this topic and their seems that some people agree it does save money do the fact your not wasting water, other seem to think your wasting energy because the system is keep the water a certain temp. I got one installed and did not want it installed but their was confusing of the options that were presented. I have noticed that when I shut down the recirulation pump the water temp jumps up to 140 degree and then quickly goes back down to 120. With the pump on the water instant at 99 degrees and never jumps over 120. My DHW is a navien ch240 that is set to 120 for DHW. My concern is that I spending more money just to have instant hot water. I know it's better than heating 50 gallons..
I have also heard that these systems cause Corrosion-erosion within the copper pipes has anyone experience such an issue?


DHW recirculating pump & Circulator Remote Bulb Aquastat,

@ February 27, 2013 12:58 PM in DHW recirculating pump & Circulator Remote Bulb Aquastat,

Sorry for the newbie question but what function does a Circulatory Remote Bulb Aquastat do with a with hot water recirculating pump? I have this gray box with a dial on it that is connected to my hot water pipe and I have no idea what it does.

Thank You

how water recirculating pump

@ February 25, 2013 7:21 PM in Navien 240

One more question my system has how water recirculating pump does help or should I still turn on the preheat? I should mention that it has thermostatically controlled pump ( i think there is box that is connected to the pipe with a romex wires connected to it) and the high temp board is set to low temp and dwh is set to 140. I will be setting the dwh down to 120 I think this is the cause the issue. I have seen this issue start right after the high temp board was installed and I was told that dip switch 7 and 8 was for hot water, which as you know on the high temp boards switch 8 is high temp and low temp setting. I also learned that if you have high temp set then you must have remote installed to controlled dhw. If I turn on the preheat how much more enery will that use?


@ February 24, 2013 9:41 AM in Ch240 remote install

Thx for the advice great info I have not had a chance to get the connector or outside sensor. As for the heat loss calc I would assume yes but you never really know. The house is baseboard heat and their seems to be enough baseboard. As for the fumes I have one hardwire CO detector with three feet of the unit, a battery CO within 10 feet and a gas and CO detector within 20 feet none of them have gone off. Could a gas leak outside affect gas composition? I have had three leaks by the union joint before the meter, I hope that issue is finally resolved. To say the least it has been a real experience converting from oil to gas. I will try to take a few Pic today.



@ February 23, 2013 3:10 PM in Ch240 remote install

So the house is built in 1984 so I am assuming it has insulation in the walls, it does have insulation in the attic The house is 2200 sq feet two floors and two zones. I have converted from oil to gas my system was installed by a pro. It has been a real experience to say the least the union joint outside by the meter leaked three times. The unit does a great job and I am happy with it but on single digit days the system struggles a little bit. I can not put the system at the high temp setting because the dhw goes up to 160 navien stated that I need the remote installed if it is switched to high temp. Also I can smell exhaust or a little gas once in a while if I am standing in front of the unit like with in a foot.


@ February 21, 2013 9:22 AM in Ch240 remote install

What advantages does outdoor reset provide?


@ February 20, 2013 7:35 PM in Ch240 remote install

Would the make wire be in the unit and do you know how long that wire is?

Ch240 remote install

@ February 20, 2013 5:58 PM in Ch240 remote install

I was wondering if anyone could walk me through installing the remote. Sorry for the newbie question. I open the box that the remote came in I see that it has a female connecter, is there a wire in the combi that is a male connector? I saw the wiring diagram but not sure if I need to run a wire or if there is a wire already in the unit.
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