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Takagi tech-support has been real helpful and they did send me out a new unit. Tech-support did explain to me their flue application requirements. 4” diameter is required to get the exhaust gases expelled properly. Any bigger diameter flue & the gases will kind of sit stagnant, not rise and...

Greetings I have a similar challenge with a Takagi 310. Current flue from a previous Takagi T-K3 install is 6” galvanized. Takagi wants 4” on the 310 model, so I’m thinking 4” stainless steel flue up through the 6” galvanized and anchor it at the top. Thx

Thx for the reply. Yep- 45° on the roof, 10’ from peak. Tech-support inquired about the exhaust vent & possible blockage. I told ‘em it was clear as a bell. Here’s a picture. Not sure how to measure the pressure between the air inlet & the flue- how would you do that? & for curiosities sake...

Thx for the reply. Yes- If the tech guys can’t come up with something solid, what would it hurt(?) to increase the pressure as you suggested. Yes- I separated the w/h from the exhaust vent per tech-support as they wanted to see if the unit would run without the exhaust system connected ( it...

Thank you for your reply Venting: Manufacturer “recommends”, not requires cat. 3 venting. Instructions don’t prohibit any specific materials. The current set up worked for a Takagi TK3 for 20 years. In the TK3 manual, it also recommended cat. 3 venting. For whatever reason, the previous...

New 2nd stage regulator was installed a few weeks ago. Out of the factory, Rego presets their regulators at 11” - this one was there. Manometer readings of old one were a bit all over the place. I haven’t dissected the old one yet- will be interesting to see inside. Current inlet static and...

Backstory & an update. A month or so back, replaced an older Takagi TK3 LPG (This is an LPG unit straight out of the factory- not a conversion model)-was installed by the previous homeowner. Replaced w/a Takagi 310 because it fit right in where the old one was- didn’t have to adjust mounting...

Tankless challenges epilogue (I hope, lol) The last 2 weeks I’ve swapped out the 2nd stage regulator and got a new gas valve assembly from the manufacture- neither one of those got the water heater working. The manufacturer finally sent me out a new water heater, which I received late Friday...

Thx for the reply Turned control panel off Turned off power supply Unplugged unit Removed screen Reset dip-switches to LPG Plugged unit back in Turned on power supply to unit Turned on unit at control panel Turned on hot water at bath & let it cycle (4 x’s) No fire up.

Thx for the reply. Old 2nd stage regulator is Rego LV4403B66R. Replaced with same. In reading Rego website info, they set their regulators at the factory to 11”. I took 2 readings today at the regulator - average was 11.11”, so I’m content with that. Pressure reading at the inlet port at the...

Thx for the reply. Dip-switch settings: 1on/2off for LPG 3-4-5 on for elevation range 7,501-10,100 ( my area is 8,700) 6 on, 7-8 off for single exhaust vent & room-air intake. I don’t think there’s any blockage on the exhaust vent, for when I’m troubleshooting with the front water heater cover...

Thx for the reply. -Picture’s of what specifically? I have tried uploading some pictures previously, but are denied because the file is too big. -I’m not familiar with what a gas takeoff is; unless my propane supplier tech’s did one when they were out on 4/12?…IDK -I installed the new Takagi...

Update: I was hoping I would be texting about my tankless water heater problems solved; not the case. Just a rehash- since 3/26, the newly installed Takagi 310U won’t work consistently. My propane supplier sent a couple of techs out (4/12) to look at the second stage regulator and water...

Update: I bought both a digital & water manometer. Hooked the water type up to the inlet port of the water heater for a static reading & it responded like a geyser when I turned the gas supply valve on. Then hooked up the digital and it was over 20” WC , so there is definitely something going...

Yes, the regulator is rated for LP. The house is 24 years old (I’ve been in it 4 years) and It’s been on propane since being built. I’m hoping it’s the second stage regulator- there’s nothing else between it & the water heater.

Thank you for your reply. If you are referring to the/these manifold pressure numbers, then yes 310U Indoor: Max: 2.42 to 3.00/ Min: 0.41 to 0.52. When my propane supplier tech comes out to install the new 2nd stage regulator, I’ll have him verify the 1st stage. Then will have him check and...

Whoops. Says file is too big to upload