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I purchased a used Lochinvar DVN051 gas water heater that was removed from a fairly new house because the owner switched to tankless. When I reinstalled it the gas valve doesn't open to allow gas to the pilot, and there's no spark at the pilot from the automatic pilot light switch. Should I have waited several minutes for the control unit to reset itself? Or could it be that I have to "purge" the lines - someone mentioned that though I don't know exactly what he meant. Or does it sound like the valve or control unit is bad?

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  • Johnny Wilmore Oct 06, 2010

    Thanks for the tip about disconnecting the power then waiting a few minutes before reconnecting it to see if it will reset. I'll give that a try next time I'm at the house where I installed this water heater. A tech services rep at Lochinvar also told me I made a mistake by disconnecting the blower (did that to listent for gas and spark) when trying to light the burner. He said the blower must be running when trying to light the pilot and burner. Does that sound correct?

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Hi,
If you are not getting any spark then you will need to turn the unit off completely and wait a few minutes. Then reapply the power and see if it reset its self...
If not then check that the power is correct. On some houses the neutral can be hot and the hot the nuetral. In this case many electronic ignitions will not work....this is called reverse polarity...

If that all checks out then you probably have a bad igniton control and it will have to be replaced...

Purging the lines may be neccesary... but if it is not sparking then that is not your problem at this time...

heatman101

Posted on Oct 05, 2010

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Can you convert the tankless water heater model # RL94in from natural gas to propane?


Contact Rinna
Some water heaters allows changeover by installing new chipboard or changing dip switches... some do not.
Propane burns much hotter with higher pressure than natural gas
Gene

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Feb 14, 2015 | Rinnai RL94i Tankless Water Heater

Tip

Water Heaters go Tankless


You may or may not have heard about these cool little devices by now, but if not, here is the low down.

Tankless water heaters are used all across Europe and come in several varieties.

1. Natural gas fired on demand Tankless
2. Oil Fired Tankless
3. Electrical Tankless

The most prevalent among these is the gas fired version.

In America, these energy savers are just starting to gain a foothold.
Leaders in the field are Titan, Bosch, Rinnai, and Noritz to name a few.

The real benefit to Tankless over Standard water heaters is that you never waste energy heating water that sits in a tank cooling until you use it.
If you have a 20 to 80 gallon water in your home, it will run night and day at odd internals maintaining it's own heat.

What this means to you is that in a typical day, whether you use hot water that day or not, is that your water heater will cycle many times to maintain it's heat whether the hot water is used or not.

Some people try to drive this wasted energy use down by wrapping their water heater with thermal blankets, or by insulating the water heater closet itself, which has only proven to be partially effective.

Also bear in mind that these Tankless water heaters are quite small compared to the Tank version, some are as small as 18 by 12 inches.
This means that your old water heater closet can now be used to store your valuables without fear of starting a fire.

A further waste of energy occurs when the exhaust heat is funneled to the outside when it could have been diverted to a heat exchanger or other energy conservation device.

Tankless water heaters perform far better in energy use than the old school, Tank type water heater by simply heating water exactly when it is needed, then shutting down when the hot water tap is turned off.
What this means for you, the consumer is that you will have hot water any time you need it, and the water will remain hot as long as the hot water tap is opened.

There are virtually no cold water periods for a tankless water heater.
You have an endless stream of hot water, without wasting a single BTU of heat, kilowatt of electricity, or ounce of natural gas.

The real surprise here is that nobody really knows just how much their utility bill is being affected by that Tank style water heater until the first utility bill arrives. The savings are immediate and significant, both in terms of less energy consumption and Dollars saved.

Let me drive that point home in real life terms.
You definitely will NOT use MORE energy after your install.
You will most Certainly use less!

There are several typical applications for Tankless systems in any common home.

1. Low Volume On Demand heaters can be installed under the sink.
2. High Volume Tankless Whole House heaters supply the entire home.
3. On demand Budget Tankless heaters can be located at the sink coupled with whole house heaters for faster hot water delivery to eliminate cold spots. These are the most popular for the beginner Tankless solutions.
Your cold water pipe is split from the cold water valve itself to the Tankless heater under the sink as well as the cold water tap. The hot water outlet is then connected to the Tankless water heater under the sink to provide instant hot water, eliminating the need for a hot water tap from the main hot water supply. This results in even less energy waste since the smaller Tankless heater uses less energy than a whole house Tankless unit.
4. On demand Tankless heaters use virtually no energy to heat unused water. When the hot water tap is off, the Tankless unit is off.

The price point for these Tankless models is fairly competitive against a standard water heater, but can sometimes be more expensive depending on the model and water volume you require. What matters most though is that these Tankless versions begin paying for themselves the day they are installed.

My final word on this is simple.
Most other countries in the world have been using tankless water heaters for a very long time due to natural gas and oil prices. Their adoption of these devices is a necessity rather than a purchase of convenience.
In terms of technology, America falls close to last place in this field, as well as many other areas where energy consumption is a factor.

When you purchase a Tankless water heater, you not only save money, but you also help the environment by wasting less energy to heat the same amount of water you consume on a per use basis. You will also use somewhat less water since you no longer have to wait for that cold water to leave the tap so the hot water will finally flow.

The choice is yours.
Choose wisely!

Please Vote for this Tip if you found it helpful.
Bob S.

on Mar 25, 2010 | Plumbing

1 Answer

How do I connect a 2nd (backup) water heater?


Not exactly sure what your reason for doing this is, but if you already have a tankless (on demand) water heater then a fair option would be to plumb that current hot water to flow into an electric or propane storage tank type heater then that plumbed to feed the house.

Dec 05, 2013 | Computers & Internet

1 Answer

Controller not working


The rinnai is a computer that heats water. It is not ordinary water heater most people are familiar with, and repairs are not do-it-yourself, requiring a trained technician qualified in that brand who can diagnose both computer and water heater problems and plumbing problems.
Call rinnai for recommended local technician. Click on support tab. Note their webpage is very short on repair details, unlike companies that sell tank-type heaters... because tankless units are not do-it-yourself.
http://www.rinnai.us/tankless-water-heater
Problem might be simple blown glass fuse on circuit board or complete failure of computer and sensors.
Here is page written for Rheem tankless, that explains general complexity of tankless computers, and showing required maintenance, such as deliming each year:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
To save problems with tankless computers plus anticipated expense of maintenance and repairs, I recommend homeowner install tank-type gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Also install one-time-use whole house surge protector, and install grounding rods to prevent further damage... lightning frequently likes the same places over and again:
http://waterheatertimer.org/How-to-wire-Whole-house-surge-protector.html
Gene
h

Aug 12, 2013 | Rinnai Water Heaters

1 Answer

Lochinvar DVN051 Water heater, I checked voltage on transformer, fine, checked pressure seitch, fine, blower runs fine, gas is on and stat clicks when I rotate it and kicks the blower os, I checked th


Copy following link for troubleshoot by type of gas control valve.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Also: Scroll up on same page for Pressure Switch heading.

Lochivar is made by Bradford White I believe.
Same troubleshoot page has link to Bradford White service manuals, and service manuals posted by AO Smith, in case this product is through one of their subsidiaries.
Rheem does not make this product, good thing for you because Rheem doesn't post service manuals.

Sep 09, 2012 | Honeywell Water Heaters

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I have a bosch mod. 45557701 tankless elect. water heater I need a new thermal cutout switch, and cann't find anyone who sells it. I have to reset all the time all day long it makes sounds like a air...


1) Call Bosch.
Gas Products Technical Support: 800-642-3111
Electric Product Technical Support: 866-330-2729

2) Save money and buy whole new tank-type
electric water heater at local box store for $250, and go on-line and get coupons before purchase.
http://waterheatertimer.org/pro-n-con-for-tankless-water-heater.html

Sep 15, 2011 | Bosch PowerStar AE125 AE125 Whole House...

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Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Sometimes people attach tankless to tank-type heater to preheat incoming cold water.
Additional tanks are also used to store solar heat, and some installations have tank-type because tankless is unreliable. Service technician can sort out the function correctly.
http://waterheatertimer.org/Tempering-tank.html

Owner should read tankless manual thoroughly, especially troubleshoot and maintenance sections. Tankless require yearly maintenance.

Since tankless are expensive to repair and replace, you might be able to fire up the tank-type water heater and provide hot water without much cost.
You can also install tank-type gas water heater yourself. Lowes sells 40 gallon for $317.00, and then you offer 10% less.
http://waterheatertimer/How-to-install-gas-water-heater.html

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Bosch aquastar Aq125-hx does not produce hot water. Pilot is ok. Gas and Flame heat is ok. water pressure is ok. Just no hot water getting to the faucets. Help.


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What is the minimum GPM's for a Rheem tanklers water heater to work? I can only run the shower by itself. Also can I install an outdoor tankless Rheem in an area where it gets down to -10 degrees F ?...


Rheem makes a number of tankless models
http://www.rheem.com/products/tankless_water_heaters/

They make a tankless 95 outdoor series
http://www.rheem.com/product.aspx?id=EBA80FAA-3C0F-411D-AF83-82061C28ED1B

The 95 outdoor series spec sheet says .4 GPM minimum activation and .26 GPM flow to keep burner activated. The colder the incoming water, fewer users can take a shower at once.
http://globalimageserver.com/fetchDocument.aspx?id=ea5f0816-dfd4-4bcf-a605-79945619f5bb
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These numbers are good when the unit is new.
After a few years the number may be different because the tankless is a high-tech machine with sensors that are susceptible to particulate in the water, and susceptible to perfect-functioning of other parts in the machine.
The outdoor series spec sheet says the tankless is good to minus 30 F.
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If electricity goes off, the house stays warm inside for several hours.
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If incoming air is taken directly from the living space, then tankless will draw air into the house through cracks and around doors.
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When buying a tankless, read the spec sheets and really ask questions about everything you don't understand.

Oct 24, 2010 | Rheem RTG-53PVN Indoor Natural Gas...

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