tankless

  1. Notshure

    Takagi T-H3J-OS-P (Outdoor) second hand, where to install 120v?

    Received heater from someone who installed it above altitude max. Had error codes. Gift yeah:/. looking at instruction manual shows simple electrical install. now, this looks like a bottom junction box with two wire nuts to secure 120v +ground. There are not any wires available on mine...
  2. TheOverThinker

    Single Shower Tankless for 3/4" Existing Gas Connection? Small apartment tankless?

    Is there an available low BTU tankless or hybrid tank/tankless unit suitable for retrofit applications in apartments, with existing 3/4" gas service? These apartments typically have a single bath with a single shower, and then a kitchen sink. Maybe a dishwasher (which could be plumbed to...
  3. napaproject

    Takagi error code 111

    Hi I have a T-K3 tankless heater using LP gas (no remote). It is in a vacation home mounted outside (recessed box) so gets relatively little use (in Napa, CA so mild winters). Hadn’t used it in while 3-4 months. When I turned on the hot water tap, it would fire up and produce hot water (and hot...
  4. TheOverThinker

    What threading is the Takagi filter - need to flush via it - TK-03-os

    I have a standard Takagi TK-03-os ( https://www.takagi.com/media/48120/T-K3-OS.pdf ) tankless unit. I'd like to flush it, but there's no cleanout or valves. However, I can do this if I can adapt and screw into the filter port. Anyone done this, and know the size and threading of that port...
  5. Roland

    Hydro Air, zones and tankless sizing...

    Hello.. I'm considering replacing multiple gas furnaces, which provide zoned heat, with a hydro-air system. My question is: If I have multiple air handlers (one handler per zone), can I use a single tankless "boiler" to feed all the air handlers? The concern is that all the zones will not be...
  6. nhandojo

    Rinnai I-series tankless combi intermittent E430

    Hello, I have a fairly new (~8 months old) Rinnai that just recently started throwing E430 (low/high water pressure error). This happens intermittently when there's a demand for DHW or CH. It can be reset and the unit would work again for a few hours and then would error out again when there's...
  7. izabella

    "Point of Use" or "Whole House Tankless"?

    I am renovating a new one bedroom, one bathroom home. It is 900 square feet in size, so space is at a premium. It means we won't be able to use the conventional big tank heater. Because we don't have gas, we'll need electricity ...and one Whole House Tankless or three Point of Use heaters in the...
  8. Benjamin

    Navien Recirculation Motion Sensor

    Hello everybody, I thought I’d share with you all how my hot water recirculation project is going. For the water heater I have a Navien-240A. For accessories I got the Hotbutton kit and two Navicirc thermal bypass valves. I set DIP switch #2 “ON” for external recirculation. I set Perameter...
  9. monkey1

    New Tankless gas water heater no flame, how to fix?

    New generic Chinese Ebay Tankless gas water heater no flame. I tried blowing and sucking on the gas inlet with my mouth and manually turn on the micro switch but couldn't blow through. New battery. Good pressure. When I manually open the micro switch, I see the ignition sparks. I also hear the...
  10. monkey1

    Tankless hot water heater related questions

    I am replacing my tankless HWH soon. I have a few questions related to the new unit. 1. My municipality provides 7 CW natural gas pressure for my residential line. If I buy a tankless HWH that is rated for 8 CW, will it run? 2. How often do I REALLY need to descale the tankless HWH with white...
  11. SeaBee Carlos

    Cover for tankless

    Need some input and advice for placing tankless water heater outside. Need to move 40 gal water heater out of closet in bedroom upstairs. Plan is to build a new closet as well as a mechanical room outside of master bedroom(downstairs). Mechanical room to be accessed from outside and enough space...
  12. Jim Em

    Surging Hot/Cold Electric Tankless Water Heater

    Recently I bought a electric tankless water heater, I have a hot/cold surging problem. PLEASE NOTE: this is an ELECTRIC TANKLESS SYSTEM. The system uses well water. OK, the inner workings of the heater There is no way to set the temperature There is no digital display on the heater It is a...
  13. Will Nicholson

    Tankless and Recirculation in two directions

    Hi all, I'm in the final stages of building my own home in Bowie, Texas, and I have an opportunity to plumb the house with hot water recirculation lines, but I have a question about that. My water heater (propane tankless -- I'm open to suggestions) will be located in a room in the corner of...
  14. CLH

    Tankless or Tank Decision time

    This is for a new build, 800 s/f apartment, DW, Sink,Washer, tub/shower combination 30X60 tub, deep, and first floor is enclosed porch with DW and sink. In the apartment 2 people. My builder is suggesting tankless, I think because the plumber already put up the wall for it in the attic...
  15. BPhillips

    Tankless water heater- no code, not firing

    Hello all, Brand new to this forum and hoping for a little guidance. The set up: I have two tankless Rudds 199,000 btu plumbed in parallel (both inlets to one manifold and both outlets to another manifold). They have been working great for a few years without any issues at all. As of yesterday...
  16. Jerry Roy

    Tankless Anode?

    Hello, Is there a solution for Tankless water heaters that don't have an anode? I saw at one time seen a link to an installable electric anode and thought it might be a solution. I don't have rotten egg smell but my tank is being eaten alive. I have had to clear out faucets from large scale...
  17. SleepingBear

    Radiant Heat System Design

    I have a question related to the radiant floor system I am installing. Context: The previous owner of our homes (two located on one property 60 feet from one another other) had ½ PEX oxygenated lines run throughout the entirety each structure. Both homes are Insulated concrete form...
  18. Terry

    Feeling stupid, my tankless water heater turns cold when I'm in the shower

    Tankless water heaters are fairly new to us, and we're just starting to find out the funny little tricks they play on us. The favorite one is water turning cold while in the shower. That like never happens with a standard vented tank water heater. The tankless is different though. For starters...
  19. Chad Sethman

    Switching from electric tank to gas tankless questions.

    Hi there, I have noticed some post that have provided me with good information but I thought I would make my own post to more specifically address my questions. I have an outdated electric tank water heater and I am considering switching to a super high efficiency (condensing) natural gas...
  20. artistsnature

    Why do I get hot water but no heat from oil boiler?

    I have a Weil-McLain oil boiler, hot water baseboard, and the supply line froze (outside tank, overhead line). This happened last year too, so I had added heating oil additive to this year's tank, wrapped the pipe in heating wire and wrapped that in insulating tape. It still froze this year...
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