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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1answer
113 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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4answers
961 views

Electric Water Heaters: Tank vs Tankless (Instant On) Energy Usage?

I've been told that a tankless electric water heater is enormously more expensive than a tank water. I have a 50 gallon water heater that I must replace. I have a friend who is a plumber telling me ...
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3answers
852 views

Can tankless water heaters be used in Europe?

I just discovered tankless water heater technology while browsing alternatives to gas based water heating, more specifically the ones designed in the United States by EcoSmart. I have been trying to ...
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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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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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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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2answers
8k views

What size breaker and wire do I need to feed a panel for a tankless water heater?

I purchased a electric tankless water heater and I would like to know the following? The unit requires 3 separate 40 amp breakers, one for each line. I have 200 amp service. The subpanel will be ...
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3answers
656 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
310 views

Tankless heater that only works in the morning

We purchased a house with an existing tankless heater (installed in 2009). It would occasionally fail with error code 11 (no ignition). Over the past 2 months it has been failing more often and now ...
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1answer
359 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
105 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
118 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
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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1answer
660 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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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
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
812 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
81 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
473 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 ...
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0answers
180 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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1answer
778 views

Tankless water heater - not consistent hot water output

I have a tankless with a descaler on the cold water input. When I turn on the hot water at the faucet it takes a minute or so to get hot water. Then I'll hear some banging/knocking of the pipes. ...
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0answers
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
97 views

Short run of propane to stove and tankless WH

I have a small stove with a propane conversion kit and a 3gpm propane tankless water heater. This is for a small MIL suite ~650 sqft. Both the stove and the water heater are on the same exterior wall, ...
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1answer
1k views

How crucial is a filter for your tankless water heater?

A plumber gave me a quote recently and told me that the tankless heater needs a water filter. This will extend the life of the tankless. How crucial is this? We do not have soft water here in Los ...
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1answer
2k views

What is the best way to mount a tankless water heater to a concrete wall?

I am planning to replace my hot water tank with a Noritz NRC98-DV tankless hot water heater. The best location to mount the new heater is in the basement on an outside concrete wall. The heater will ...
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1answer
2k views

How could a hot-cold plumbing crossover spontaneously appear?

OK, this is a weird one. Follow the bouncing ball: I have a tankless water heater I've had problems the last few weeks with the water running lukewarm instead of hot. Someone suggested power-cycling ...
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0answers
591 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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2answers
212 views

Why do both water tanks have hot inputs? Is my boiler (on-demand) feeding into my hot water heater?

I have an interesting setup that I'm trying to understand (without tearing apart sheetrock). I have two electric tank-based water heaters, and a tankless gas water heater that is used for the boiler ...
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1answer
912 views

Tankless water heater requirements

I'm looking at the possibilities of replacing my water heater. Currently we have an electric, 2 element, 50 gallon tank heater that is 32 years old and almost ready to go. The water can sometimes come ...
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1answer
88 views

Tankless hot water heater cycles on without any water running

Why does the tankless hot water heater cycle on even when no water is running?
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1answer
48 views

Need help with install for weil mclain oil boiler

I just bought a weil mclain oil boiler with tankless. Can anyone tell me the configuration to plumb it? I asked two heat guys how to plumb it and they gave me different setups. I plumbed it ...
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1answer
1k views

Which is better indirect or tankless hotwater heater

I am in the process of getting my boiler and hot water heater replaced. One company gave me a quote for a Weil McLain boiler and indirect hot water heater. Another company gave me a quote for a bosh ...
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1answer
2k views

How to determine tankless water heater requirements?

I'm considering replacing my insufficient 30 gallon gas water heater with a tankless water heater equivalent to 50 gallon gas heater. I know a 50 gallon heater would serve my needs. Questions ...
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2answers
400 views

Can I replace my oil-based water heater with several electric ones?

I was looking at this question, which is somewhat related to mine but didn't give me a good answer: How to evaluate the suitability of an electric tankless water-heater Basically, my mom's water ...
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1answer
308 views

How to evaluate the suitability of an electric tankless water-heater

I'm trying to evaluate if an electric tankless water-heater would be suitable for my home. There are just too many variables to consider, and I wonder if there is a mathematical approach to it. I'm ...
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0answers
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 ...