Questions tagged [tankless]

A tankless water heater directly heats water on demand, instead of maintaining a reservoir of hot water. Use this tag in conjunction with the [water-heater] tag

21 questions with no upvoted or accepted answers
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Tankless 240V water heater in detached garage tripping AFCI/GFCI breakers in house

We have two separate buildings, a house and a garage/workshop, about 20 feet apart, sharing the same electrical service. On the service entrance, there's a Siemens whole-house surge protector. The ...
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1answer
753 views

Chemical Smell After Tankless Water Heater Install

I recently had a plumbing company install a tankless water heater in my crawlspace. Everything with the install works and looks great, but we are experiencing a very strong chemical smell (like nail-...
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28 views

Why momentary chemical smell after Tankless Hot Water Heater install

Why is my hot water stinky for a few seconds? This is a strong but hard to describe chemical smell like CPVC glue, not rotten eggs and not sewage or gas. I put in a new propane-fired tankless water ...
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45 views

Tankless Hot Water Recirculation

I recently had a Rheem Tankless Water Heater installed. The rtgh-95dvln-2. They installed the pump kit meant for the water heater, the ap17920. However, I do not have a dedicated recirculation line, ...
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44 views

Installation of Liquid Propane Gas line to new Takagi Tankless Water Heater

I'm installing a new Takagi Tankless water heater and wanting to make sure I have the line plumbed to the unit correctly. I have the Main line @ 3/4" hard Pipe, 3/4" Ball valve, 3/4" Flex Line, Tee ...
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43 views

unique ? about venting tankless water header

I am installing a tankless water heater at the house. My question is unique because I can not find a reference anywhere in the code and the installation manual about where to place my exhaust vent. I ...
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0answers
131 views

Furnace draft inducer switch tripping

I have an older furnace and a brand new natural gas instant water heater that I installed. I only start this way because the furnace had one thing break last year, so I'm not sure if things on it are ...
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0answers
59 views

Service needed to add a tankless water heater

I am currently building a detached 250 sq feet studio in my backyard. The studio will have a tiny bathroom with a tankless water heater, a baseboard heater, and a few lights, a mini split (ac), of ...
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595 views

When upgrading a gas meter, do you need to install/upgrade regulators for natural gas appliances?

I live in TX and have Amica as my natural gas provider. I want to replace my tank water heaters with a tankless unit. According to the Amica tech, I will need an upgraded gas meter which would ...
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0answers
118 views

Tankless water heater - Electric issue

I have a AuqaPower Tankless water heater I installed myself 2 years ago. I used the old wire from old (tank) water heater and I ran a new wire for the 2nd place. It has worked great for 2 years and ...
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2answers
848 views

T&P valve draining - expansion tank issues?

I am having issues with my Water Heater. It's a slantfin tankless boiler (TR-30 PT). It's running on a 4 zone setup. I typically only use one of the zones though. We've been in the home for a year and ...
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327 views

What type of air conditioner to look for

I'm looking for a portable air conditioner that can be moved from room to room. But the key thing I want is one that does not use a condensation tank. I know they exist because I have seen one. It ...
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10 views

Service valve attachment for a Bosch tankless water heater

Has anyone installed a service valve for a Bosch Greentherm tankless water heater? In-line 3/4" service valves are available on the internet but this unit has built-in valves at the bottom. They ...
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37 views

Tankless hot water system only providing luke-warm water?

I have tankless hot water which has been working well up until this week. A week ago we discovered a leak on the hose from the propane tank, so we replaced the hose, but since then it hasn't seemed ...
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1answer
41 views

How can I figure out if a Combi Boiler will be adequate for my house?

We recently moved into our new home that currently has a Super Hot MG-100 Hydronic Boiler (installed in 1986, when the house was built). Clearly, it's done its job and in need of a replacement. We had ...
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34 views

Rinnai tankless water heater service cost

My tank-less water heater stopped working with an error code 11. I had somebody out to take a look at it. relatively quickly we went through the troubleshooting steps and concluded the flame rods/...
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22 views

Replacing electric tankless water heater

I'm replacing my broken seisco 28 using 2 - 60 amp circuits with a ecosmart 18 using 2 - 40 amp circuits. Looks easy but can I use the existing circuits. I'd hire a professional but I live miles ...
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1k views

Can I use a sub-panel to supply a tankless water heater that requires three breakers?

I plan on installing a Echo 27 Tankless Water system but it requires 3 40 amp breakers. Can I install a sub panel to accommodate this and if so what size?
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184 views

Tankless Recirculation Loop as Hydronic Radiant Heating

While researching ways to heat a small bathroom (28sq. ft. total), I came across a post that someone put some narrow piping above a bathroom subfloor and cemented it in under the tiling. They were ...
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72 views

Upgrade to a tankless heater

My water heater went out and I'd like to replace it with a tankless. Electrical setup is as follows: A.O.Smith 50gal water heater - 1, 30amp double pole breaker Tankless needs - 2, 40amp double pole ...
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1answer
16 views

Adapter for NTC boiler probe

I just bought a replacement NTC probe for my boiler (bought with specific part number) but once the item arrived I noticed the connector wasn't matching. I think this is due to past maintenance when ...