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Thread: Problem with Takagi & Radiant Heat &Domestic Hot Water

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  1. #1

    Default Problem with Takagi & Radiant Heat &Domestic Hot Water

    Last year I remodeled my home and installed plex tubing throughout my 2 unit building. Upon the advise from a company back in Vemont, I installed a Takagi Jr. to run the radiant heat and domestic hot water supply.

    The downstairs unit works like a charm with no problems (although I did have to remove all flow restrictors from faucets and shower/bath tub).

    The big problem is with the upstairs unit. Back in February, the domestic hot water seems only to work when the radiant system is turned on and burning. I called Takagi twice and they sent 2 repairmen but they looked overwhelmed by the system and said the system works fine and they could not find anything wrong with the water heater.

    I shut off water to the tankless and turned on the hot water to a facet upstairs and found there was no cross water line. The company who sold me the pre-assembled board is going to send me a new one provided I do not ask them for any more technical advise (which by the way, I spend nearly $1500 on all new faucets and replacing the shower unit).

    I am now in a situation where everyone is pointing fingers at each other. Takagi says something is wrong with the plumbing, Vermont Company is saying its the Takagi, and the plumber saying there is no cross water lines.

    Frustrated, I am ready to let the Takagi Jr. take care of the radiant heating supply and I will install back a traditional hot water tank.

    I was so frustrated that I even offered to buy an airline ticket for an employee of the Vermont company that sold me the system to come out West. Their response was take a new set up but don't call us anymore.

    My tenants have been very patient but I want to give it one last try to fix the system. It works so well down stairs. I am going to swap machines to see if this helps and prove once and for all if it is indeed the heater.

    Could I have the wrong size Takagi? The upstairs has 2 bathrooms, kitchen, and washer.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    How many BTU does the thing draw? What's its rated gallons/minute? I assume you have a heat exchanger for the radiant heat, as you wouldn't want to run potable water through all those lines.

    What is the heat load on the house? In other words, how much heat do you need in your boiler (heater)? Does the system operate with priority zones? If the priority scheme is not set up properly, (i.e., when you call for hot water for washing, showering, etc.), if it is still providing heat to the heat exchangers for space heating, the potable water will never get hot enough. It needs to bypass the heat exchangers. If the zone valve or pump is still running, you won't get any hot water for the shower. Both units need to restrict flow to the heat exchanger(s). A diagram of what you have might be useful.

    It could be as simple as a stuck or improperly positioned check valve, zone valve, or pump.

    I'm not a fan of using a potable water heater (tankless or conventional) for space heating.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Master Plumber master plumber mark's Avatar
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    Talking install the tank...

    you installed this in RENTAL PROPERTY????

    is that correct, you mentioned that your tennants have been very patient???


    so you are having to constantly go over and fool around at this property to figure out what is going on??


    I dont think that this was a good idea in the first place becasue of the demands that tennants usually make on the lanndlord anwway


    I suggest you install a 50 gallon gas heater for their domestic needs,

    and cross your fingers and hope the takagi can give you trouble free service on the radiant heat side of this system or some cold winter day the tennants will be screaming for heat..


    good luck

  4. #4
    DIY Senior Member houptee's Avatar
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    Default Takagi for heating

    I would like to see some pics of how this Takagi is piped for your heating system, and what controls are being used etc.

    I want to do the same thing but not have system supply domestic hot water, just run the cast iron radiators after I repipe with pex and home run it all back to manifold setup.

    Any advice on that from anyone?

  5. #5
    Master Plumber master plumber mark's Avatar
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    Talking go for it...

    have never heard back from that first fellow to even
    find out what has transpired.....

    to do something like he did you got to be a glutton for punishment


    as long as it dont break down on the coldest day of the winter
    you might get by ok....


    good luck

  6. #6

    Default Takagi piece of junk

    I too have a problem with my water TAKAGI water heater. We bought a T_K2. It lasted about four years then the dreaded number 12 error code comes up. Takagi tech support was very unknowledgeable. We sand and dismantle, and clean and spray, still nothing. They then blame it on the gas pressure. Gas company came out four times, to make us happy, they changed out the regulator, the meter, and measured the pressure. Nothing is wrong except the Takagi system. Now the company blamed it on installation. It was installed and inspected, and working for four years. hmmmm. They will not negotiate or work with us. Offered us an upgrade at an outrageous price, said I could pick one up cheaper on the internet. Whoa, what do you mean cheaper, if you don't buy it from us then we won't honor the warranty even though it's a brand new unit from an internet store..not ****..said the TAKAGI rep. Not only that but they called back and harrass me about the name of the internet company that sell their product cheaper then them. I have no hot water, my daughter is crying, and they worry about someone undercut them? We have gone back to the tank system, phew...hot water...a word of advise, tankless system doesn't really save energy, water pressure weak if you use hot water at more than one faucet, and when it's time for repair, don't call a plumber because all they know how to do is install. If you really want to go with tankless, stay away from TAKAGI...try Rheem, at least GE stand behind their products.

  7. #7
    DIY Junior Member techsavy's Avatar
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    Quote Originally Posted by tamileetx View Post
    I too have a problem with my water TAKAGI water heater. We bought a T_K2. It lasted about four years then the dreaded number 12 error code comes up. Takagi tech support was very unknowledgeable. We sand and dismantle, and clean and spray, still nothing. They then blame it on the gas pressure. Gas company came out four times, to make us happy, they changed out the regulator, the meter, and measured the pressure. Nothing is wrong except the Takagi system. Now the company blamed it on installation. It was installed and inspected, and working for four years. hmmmm. They will not negotiate or work with us. Offered us an upgrade at an outrageous price, said I could pick one up cheaper on the internet. Whoa, what do you mean cheaper, if you don't buy it from us then we won't honor the warranty even though it's a brand new unit from an internet store..not ****..said the TAKAGI rep. Not only that but they called back and harrass me about the name of the internet company that sell their product cheaper then them. I have no hot water, my daughter is crying, and they worry about someone undercut them? We have gone back to the tank system, phew...hot water...a word of advise, tankless system doesn't really save energy, water pressure weak if you use hot water at more than one faucet, and when it's time for repair, don't call a plumber because all they know how to do is install. If you really want to go with tankless, stay away from TAKAGI...try Rheem, at least GE stand behind their products.
    Quote Originally Posted by siammurph View Post
    Last year I remodeled my home and installed plex tubing throughout my 2 unit building. Upon the advise from a company back in Vemont, I installed a Takagi Jr. to run the radiant heat and domestic hot water supply.

    The downstairs unit works like a charm with no problems (although I did have to remove all flow restrictors from faucets and shower/bath tub).

    The big problem is with the upstairs unit. Back in February, the domestic hot water seems only to work when the radiant system is turned on and burning. I called Takagi twice and they sent 2 repairmen but they looked overwhelmed by the system and said the system works fine and they could not find anything wrong with the water heater.

    I shut off water to the tankless and turned on the hot water to a facet upstairs and found there was no cross water line. The company who sold me the pre-assembled board is going to send me a new one provided I do not ask them for any more technical advise (which by the way, I spend nearly $1500 on all new faucets and replacing the shower unit).

    I am now in a situation where everyone is pointing fingers at each other. Takagi says something is wrong with the plumbing, Vermont Company is saying its the Takagi, and the plumber saying there is no cross water lines.

    Frustrated, I am ready to let the Takagi Jr. take care of the radiant heating supply and I will install back a traditional hot water tank.

    I was so frustrated that I even offered to buy an airline ticket for an employee of the Vermont company that sold me the system to come out West. Their response was take a new set up but don't call us anymore.

    My tenants have been very patient but I want to give it one last try to fix the system. It works so well down stairs. I am going to swap machines to see if this helps and prove once and for all if it is indeed the heater.

    Could I have the wrong size Takagi? The upstairs has 2 bathrooms, kitchen, and washer.


    Could it be that the upstairs is connected in series with the recirculation pump that runs the heating application? If this is the case, your upstairs fixture simply will not operate unless the pump is running. Take a look at the set-up and see if there is a pump located before the line that tees off to the fixture that you are speaking about.

    If you can post a diagram of the system, I would be able to identify your problem.

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