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

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9 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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34 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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24 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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1answer
32 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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1answer
53 views

Water heater noises when my neighbor's sprinklers are active

Hello I recently (few months ago) installed a tankless water heater following a failure of the old 55gal gas heater. Performance has been fantastic, it actually resolved a number of problems, but I ...
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2answers
88 views

How to make a flushometer toilet look nicer?

I'm the new owner of a 3 bed, 2 bath condo in Chicago, built in 1923. It's lovely and old. Both toilets are flushometer style, tankless. They look exactly like a toilet you'd see in a public school (...
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1answer
15 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 ...
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1answer
57 views

tankless water heater with four lugs

I'm replacing a old tankless with a new one. The old one is wired with 240 on two 60 amp breakers. It had two lug connects along with a ground. The new heater is 4 lugs and requires two 60 amp ...
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28 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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5answers
843 views

Installed Electric Tankless Water Heater - Internet loss when active

I installed an Ecosmart 27kw tankless water heater yesterday and as far as heating the water goes, everything works perfectly. The issue is when the water heater is running, I lose internet! Specs: ...
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1answer
86 views

Tankless water heater and shutting off main water supply

I have a tankless water heater, love it! And it's not the issue. I have a very leaky shower. I've been in my house for almost 20 years and for the first 10, I didn't mind the very slow drip since my ...
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1answer
44 views

Planning to switch to a tankless water heater

I am planning to convert to a tankless water heater but have a few questions to make sure I am on the correct path. I live in a rowhouse in Philadelphia where natural gas is used for heat and my ...
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1answer
195 views

Derating 6 current-carrying conductors?

I'm having a hard time understanding 310.15(B)(2)(a). Here's the boat I'm in: I hooking up a tankless water heater that calls for 3 40 amp breakers (it's a 24 kw Ecosmart). So I put in a sub panel in ...
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4answers
2k views

Want to switch to tankless, but can I use my existing wiring?

The tankless water heaters I am looking at require 8 AWG wire but the existing wiring is 12 AWG. Can I do this without having to rerun new wire?
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2answers
228 views

Will a 2 PSI natural gas line be sufficient for a tankless water heater?

I'm planning on installing a tankless water heater that maxes at 160K Btu. I only have a 1/2" line from the meter to the furnace(75K) in the same room. The city told me that there is 2lb gas from ...
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2answers
378 views

Tankless Water Heater and turning off main water supply

I presume there must be plenty of protections for such a case, but is there any reason to be concerned if I turn off (or my fortrezz value and smartthings turns off) my main water supply and my Rinnai ...
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1answer
260 views

Tankless water heater plumbing: neutralized condensate and pressure relief valve

Hello recently my old 50gal gas water heater developed a crack and started leaking. I replaced it with a tank-less gas heater. Everything is good, I installed the proper intake an exhaust with 3in ...
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4answers
224 views

Can my home's power supply handle this tankless water heater?

So my home was built in 1960 and 15-20 years later another room was added on. There are panel boxes everywhere ha. I have mapped it all out and isolated almost everything. Anything that is ...
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2answers
59 views

Tankless hot water to heat home

I have a 1200 square foot second floor apartment that is presently heated using a forced hot water radiator system. The system is called a Paloma "Paloma Pak" heating system. It is basically a ...
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2answers
283 views

16“ center bracket to 24” center framing

I'm installing a tankless water heater (150lbs static load, 10" deep) I only have one option for installation and it is a 2x3 framed wall with 24" centers. The Top bracket is designed to mount on ...
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3answers
64 views

Is a tank less water heater a bad choice for a house with low water flow?

We are thinking of replacing our current natural gas tank water heater by a high efficiency tank less heater. However we have a water main issue, the house is from 1930 and the main is partially ...
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1answer
75 views

Tankless Water Heater - wasting water

It takes a while for the water to heat going to the tankless water heater and in doing that, a lot of water gets wasted. Is there such a thing as a pre-heat switch that would start the heating ...
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1answer
46 views

Tankless water heater venting

Most of the images show 90 degree angles for the venting. Can I run mine at a 45 degree angle like the image below?
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2answers
267 views

help determining amp service to my house

I'm considering installing an electric tankless water heater in my house, but need to know what amp service I currently have. I read that you should look at the amps on the main breaker to the house ...
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0answers
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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108 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
56 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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348 views

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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0answers
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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0answers
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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0answers
578 views

Chemical Smell After Tankless HWH Install

I recently had a plumbing company install a tankless hot water heater in my crawlspace. Everything with the install works and looks great, but we are experiencing a very strong chemical smell (like ...
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1answer
50 views

what is a reasonable amount of condensate water produced by my pump?

I have a Ruud hi-efficiency furnace and also a Ruud tankless hot water system, both with condensate lines running down to the pump. My problem is... the pump runs (intermittently) ALL day long..lol.. ...
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1answer
61 views

17 years old tankless, fix or replace?

I have a 17 years old conventional tankless combi boiler, it has a 'spilling' 3-way and DHW exchanger clogged by limestone. Should I fix it or I'd do better replacing the whole boiler with a new ...
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1answer
686 views

Can 8 foot tall 2“ x 2” furring strips attached to a floor plate and joists hold a 60 lb water heater? [closed]

I'm trying to hang a 60lb tankless water heater in my basement against an exterior wall and trying to figure out if I can get away with 2" x 2" pine furring strips and some plywood. Assuming minimal ...
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1answer
107 views

How to modify and redirect the tankless water heater steam exhaust away from the house?

I am seeking help from this community to come up a creative solution on how to make a minor/elegant modification to direct the steam exhaust to go outside and away from the house. Right now, it will ...
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2answers
831 views

Do I need separate expansion tanks for my boiler and hot water heater?

My hot water tank went and I'm trying to replace it with a tankless system, but the old water heater did not have an expansion tank installed with it. In my previous house I had a combination unit ...
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2answers
1k views

Can a tankless water heater outlet pressure be increased without a second heater?

My father-in-law has a five-bedroomed house with three bathrooms, two of which are in use. The household is gravity-fed with a cold water tank on the roof, and a gas-fired tankless water heater on the ...
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4answers
2k views

Buffer tank on input or output of tankless water heater?

As I understand it, in residential systems, tankless water heater are commonly paired with a buffer tank to deal with the "cold sandwich" and finite capacity of tankless heater1. This seems ...
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1answer
2k views

How to chlorinate a tankless water heater?

I live on a private well and have had a tank for a while. Every few months I'd have to chlorinate the tank (with hydrogen peroxide) to get rid of the rotten egg smell. Two local plumbing companies ...
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3answers
632 views

Tankless point of use water heater that only heats when inlet is cold

There are other questions such as this that ask about a point of use heater to provide quicker hot water, but they don't seem to fit what I want. Our kitchen sink takes a while to get hot, and I ...
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1answer
342 views

Should I go with a stainless steel or copper based tankless water heater?

I live in Southern California, Orange County to be specific, and want to replace my 40 gallon (gas) water heater located in the middle (inside) of the house with a tankless water heater (electric ...
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2answers
103 views

Should I replace my conventional interior water heater with an exterior tankless model?

I'm shopping for a tankless water heater. When the salesman talked to me, he told me they install them outside and this is better because then the tanks do not take up room inside the house. I'm ...
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2answers
641 views

tankless water heater before the reg hot water

What if I installed a new tankless water heater before the regular hot water heater, so that the tank water heater is getting filled with hot/warm water vs the 40 degrees water its getting now? Our 80 ...
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1answer
47 views

What is this “on” cap that's adjacent to my tankless water heater's service valve?

There's a "cap" next to my water heater's service valve that says "on" with an arrow. What is this "cap" and its purpose?
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2answers
114 views

What is this pipe beneath my tankless water heater?

While watching videos about draining tankless water heaters, I noticed none seem to have this beige pipe with odd silver cab at the end. Does anyone know what this is and its purpose?
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1answer
622 views

Wiring washer, dryer, tankless water heater

Trying to wire for washer/dryer combo in the garage, and we need to add a tankless water heater to get hot water to the washer. In their current location, there's a (EDIT: 15) AMP circuit for washer, ...
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2answers
2k views

Pex Pipe Freezing & Tankless Hot Water Heater Too

I have Pex pipes. My issue is freezing pipes and tankless hot water heater on the north side of my house (built in 2009) where my master bath is (the tankless is on the outside of the house on that ...
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1answer
753 views

Protecting PEX Outdoors

I am installing a tankless water heater, which is an outdoor model. We are likely to use PEX when redoing the plumbing, but because the heater is outdoors, we will need to have a short, outdoor PEX ...
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1answer
80 views

Residentail Tankless Water Heater Electrical Concerns

So the electrical install guide for Ecosmart ECO 18 requires 2 (two) 40 amp double pole circuits. They specifically mention running two grounds too which I gather would be provided if NM cable w/...
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1answer
440 views

Isolation valves on tankless heater: is this setup ok?

I had a tankless water heater installed with isolation valves. The setup that I got is a little different from what I normally see, and I'd like to make sure that this is a good solution and I'd like ...