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Old 01-17-2018, 02:06 PM   #1
Preston1977
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Default Tankless issues

At the end of August I replaced the old tank water heater with a tankless Rheem RTG-84 XLP-1 and itís been very disappointing. My house is a 2 bath home, both bathrooms are about 35í away from the water heater. No matter the temperature outside the water heater is very inconsistent with providing hot water. The hot side of the valve can only be slightly on to provide hot water to either tub, if I crank the valve wide open the pressure drops drastically and the water gets room temperature at best. The 2 showers, kitchen sink and bathroom sinks get just above room temperature but keep pressure.

Has anyone experienced this and if so howíd you resolve it? Iíve had 2 plumbers out and neither can figure out. Iíve reset it with no luck and checked the filter. Calling customer service gets me no where. Iíve seen a YouTube video where the home was comparable to mine and plumber installed 2 tankless water heaters in tandem with no problems. Thanks in advance, Preston


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Old 01-17-2018, 03:56 PM   #2
havasu
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Have you read the reviews for this unit? Not too favorable. I would either return and replace this unit, or add a recirculating system.


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Old 01-17-2018, 11:51 PM   #3
Preston1977
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Unfortunately i didn't read them until day 2 after the install 😐🔫. I tried a recirculating pump but the water heater constantly threw a fault code. I kinda have been leaning towards replacing it with a different brand and I was prepared for that answer lol, itís such a turd
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Old 01-18-2018, 01:57 AM   #4
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I had a Navien TWH installed, and it comes with a recirc pump built into it, along with a hot water chamber to stop the hot/cold/hot system. I loved it until I sold that house.
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Old 01-18-2018, 04:05 PM   #5
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you need to know temp rise at what flow rate. If your water comes in the house at 65 and you want 120 out that is your rise. So you need to find the flow rate at 55-degree rise. It is throttling down because it can only heat so much water at such a flow rate.

I wish people would educate themselves because some of these companies only want to make the sale. Then it is to bad for you.
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Old 01-18-2018, 09:49 PM   #6
Socal37plumber
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You might want to check,the gas line feeding your water heater.I come across many tankless heaters.And they are installed,without the installer doing the correct gas calculations.
Btw way Rheem in general isn't the best manufacturer out there.Norowitz is the tankless I install.
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Old 01-19-2018, 01:22 PM   #7
Preston1977
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Quote:
Originally Posted by CT-18 View Post
you need to know temp rise at what flow rate. If your water comes in the house at 65 and you want 120 out that is your rise. So you need to find the flow rate at 55-degree rise. It is throttling down because it can only heat so much water at such a flow rate.

I wish people would educate themselves because some of these companies only want to make the sale. Then it is to bad for you.
Yeah I certainly didnít do enough homework before I made the purchase. I was solely focusing on gpm. I didnít know there was a more to it than that nor did the plumber I work along side of give me that much guidance.
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Old 01-19-2018, 01:27 PM   #8
Preston1977
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Quote:
Originally Posted by Socal37plumber View Post
You might want to check,the gas line feeding your water heater.I come across many tankless heaters.And they are installed,without the installer doing the correct gas calculations.
Btw way Rheem in general isn't the best manufacturer out there.Norowitz is the tankless I install.
The gas company down here came by prior and did the calculations and told me what I needed to do to get the btuís. I had to put the house on a 2lbs system with 2 separate lines beyond the meter each with its own regulator. 1 line feeds the house while the 2nd is solely for the water heater. The line to the water heater is 1Ē, 27í in total length, only 1 90 and reduces down 4Ē from the the water heater.
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Old 01-19-2018, 01:33 PM   #9
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I’m currently looking at a Rinnai RU98EN. I can pick it up for around $1300 shipped, twice the cost of that rheem but if it works then it’s worth it. I just have to do some research on the temperature rise. I’m about 10 miles SE of New Orleans so we only get this freezing weather for a week or 2 out the year so the water temperature out the ground usually isn’t freezing cold.


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