Jetglas Day & Night water heater age decoders, Day & Night water heater company history, & water heater manual sources.

In this article series we give details of how to decode water heater age for all water heater brand. We also discuss the conditions, maintenance, and factors that affect how long a water heater can be expected to last.

Day & Night - JetGlas Water Heater Age & Manuals

Jetglas® Water Heater Age Decoder

[Click to enlarge any image]

Case 1: More-Recent JetGlas water heater age decoder

YMnnnnnnn where the first character encodes the year in a 20-year cycle running as follows

First character Y = Year of manufacture

F = 1989, G = 1990, H = 1991, J = 1992, K = 1993, L = 1994, M = 1995, N = 1996, O is not used

P = 1997, Q & R not used, S = 1998, T = 1999, U-V not used, W = 2000, X = 2001. Y = 2002, Z = 2003

A = 2004, B = 2005, C = 2006, D = 2007, E = 2008, F = 2009, G = 2010, H = 2011

I = 2012, J = 2013, K = 2014, L = 2015, M = 2016, N = 2017, P = 2018, S = 2019

Second character M = Month of Manufacture

A=January to M = December, with the letter "I" not used

Example: Serial No: LF3337645 (Amber PA plant) from reader Cecil Lockyer

L = either 2015 or 1994

F = June

Case 2: Older Jetglas Day & Night Water Heater Age Decoder

...

The following is our guess based on examining various Day & Night water heater data tags and comparing those with what's known about the building age or other contextual information where the water heater was found:

NNYYWW

where YY is the 2-digit year

and WW the 2-digit week of manufacture.

If you have an older Day & Night Water heater like Jeff's, shown here, try this age decoding and compare that with the known age of the home as a test of reasonableness.

Post a photo of your water heater and its data tag along with comments at the end of this page.

• D&B Distributing has claimed the Jetglas name and put up a website at jetglaswaterheaters [dot] com
• See more details about the production of Jetglas water heaters
  
  at BRADFORD WHITE WATER HEATER AGE & MANUALS

Below: as you may not find an original Day & Night electric water heater manual, we offer a more-modern copy from Bradford White that may be helpful in inspecting, repairing, or maintaining your older Jetglas water heater.

• BRADFORD WHITE ELECTRIC WATER HEATER INSTALLATION & OPERATION MANUAL [PDF], (2014) Bradford White Water Heaters, 725 Talamore Drive
  Ambler, PA 19002 USA, Website: http://www.bradfordwhite.com Tel-USA: 800.523.2931, Tel-Canada: 866.690.0961 International Sales 215.641.9400, Warranty Department 800.531.2111, Contractor Technical Support 800.334.3393, retrieved 2018/02/27, original source: http://www.bradfordwhite.com/sites/default/files/product_literature/238-44422-00N.pdf

History of the Day & Night Water Heater Company & Early Solar Water Heaters

Above: a Day & Night Jetglas water heater advertisement from 1961.

The Day and Night Jetglas Jupiter-model water heater a well as some other model names were were products of William J. Bailey's Day & Night heater company that began with Bailey's invention of a solar water heater in California in 1909.

The "Day & Night" name reflected Bailey's design that combined a solar heating element (obviously only collecting heat in the daytime) and an insulated hot water storage container that would continue to provide domestic hot water "at night".

Jetglas referred to a liner coating the interior of the hot water storage tank that gave long tank life: a feature that the company promoted by advertisements that warned of leaky water heaters from its competitors. We show some of those advertisements from the 1950s and 1960s below in this article.

There were earlier efforts at solar water heating, as you can read

at SOLAR WATER HEATER ANTIQUE but it was Bailey who pioneered the use of convection to circulate and heat water, insulation to retain water heat, and other water heater features.

You'll see that phrase in some of the early patent disclosures we include later in this article.

Below: three pages of an advertising brochure for an early Day & Night Water Heater, showing the heater's internal design.

... ...

Excerpts:

The Day & Night Combination water heater is so called because it combines the storage tank and heater which were separate parts in earlier methods of heating water. The storage tank in that case consisted of a range boiler, and the heater was generally a small coil type heater connected to the boiler at one side.

The Day & Night Combination boiler is made of the same high-grade hot rolled annealed steel that is used in the highest-priced automatic water heaters. It is welded by the electric arc process on an automatic seam welder which assures greater strength and uniformity than is possible by hand-welding.

Galvanized by the hot dip method in our own plant and subjected to careful inspection inside and out, the Day & Night Combination boiler receives the same careful attention given all Day & Night high quality water heaters.

The exclusive flue design of the Day & Night Combination accounts for from 15% to 20% greater economy than the conventional straight flue and baffle. This Day and Night feature is known as a "heatwave" flue and is also found on certain Day & Night automatic models.

The burner in the Day & Night Combination heater is an important factor in trouble free operation of the heater and is also an exclusive Day & Night design.

Bailey's concept of a well-insulated hot water storage tank was a key feature that he later extended to a gas-fueled water heater, and the company later expanded to produce other heating and even air conditioning equipment.

Thanks to Wikipedia's entry on the history of ICP - International Comfort Products - who own the brand:

Day & Night began as a solar water heater company in 1909 in Monrovia, California, providing Californians with round-the-clock hot water. It ventured into space heating in 1930s.

Photo above of Bailey posing by a sign for the Day & Night Solar Heater Co., from Butti & Perlin, 1980 cited below.

After extinguishing the name in 1997, the Day & Night brand name was resurrected in Western US and Canada in 2009. - 2022/01/21 original source: https://en.wikipedia.org/wiki/International_Comfort_Products

Your water heater was produced by that original company at its La Puente, California plant.

By the 1930s the Day & Night company was also producing heating and air conditioning equipment.

Other sources point out that the original Day & Night brand was bought by Dresser Industries in 1945.

Below: In the U.S. in the 1950s and to at least the mid 1960s, the Day & Night Water Heater Co. warned consumers that lesser water heaters may leak and flood their home.

...

Like a lot of mechanical systems brands tracing the history of the Day & Night heater brand is dizzying, with companies being bought, buying themselves back, merging, and later disappearing only to reappear in a new incarnation.

The current "Live" version of the Day & Night Brand is at https://www.dayandnightcomfort.com/ whose actual physical location was not found at that web page.

• Baermann, W., Day a Night Water Heater Co, 1941. WALL HEATER or SIMILAR ARTICLE, [PDF] US Patent No. USD125123, assignor to Day & Night Water Heater 10., Ltd., Monrovia. [This was a wall heater as described, not a water heater - Ed.]

• Bailey, William J. SOLAR HEATER [PDF] U.S. Patent 966,070, issued August 2, 1910.
  Excerpt:
  Briefly, my invention consists in causing the water to circulate through tubes having thin walls and of relatively small cross sec tion and of extended length, the said tubes being exposed to the sun's rays.
  
  Heretofore water has been passed through chambers which were exposed to the sun's rays, but such chambers were of comparatively large 30 capacity and held a large body of water and were not of an extended length, said chambers acting as both reservoir, and heater.
  
  In my invention, the water while it is being heated is split up into small streams by small tubes of considerable length and the tubes are of a good heat conducting material, such as cop per, so that the small streams of water con fined in such tubes are quickly heated to a high degree.
  
  These tubes in my invention being purposely very small, do not act as reservoirs, but as heaters only.

Above: W. Bailey's 1917 Solar water heater patent showing the solar panel and an insulated water storage tank in the building's attic space.

• Bailey, William J. SOLAR HEATER [PDF] U.S. Patent 1,242,511, issued October 9, 1917.
  Except:
  The main object of the invention is to provide for supplying water at the fixture to be used under full head, and enable the liquid which is circulated through the sun coil to be under a much lower pressure.
  
  Two important and valuable advantages are derived from this, one of which is that it enables me to construct the sun coil of lighter ma terial as it does not have to withstand a heavy pressure, and the other is that it en ables, a relatively small amount of liquid to be utilized to circulate through the sun coil in a system independent of the water supply system, so that in case of freezing of the liquid in the sun coil which is in an exposed position, only that liquid which is in the sun coil circulating system will escape if the pipe or coil bursts, whereas in the systems as now constructed, should a coil or pipe burst, the flow of water will come directly from the supply and a large amount be wasted before it is shut off.

• Bailey, Burton G. COMBINATION WATER HEATER & DISTILLER [PDF] U.S. Patent 2,224,131, issued December 10, 1940.
  Excerpt:
  My invention consists of a Water heater with a Water distilling apparatus in cooperative rela tion therewith for distilling Water for use and the objects of my invention are:
  
  First, to provide a combination water heater and distiller in which the water heating element performs both functions of heating the Water and preparing distilled water for use;
  
  Second, to provide a combination Water heater and distiller of this class by the use of which Vapors Created by the heating element are drawn off separately from the Water and used as dis tilled water;
  ...

Below: Lee Bailey's portable solar power generator and water heating system, patented a century after William Bailey's original works.

• Bailey, Lee. PORTABLE SOLAR POWER GENERATOR AND WATER HEATING SYSTEM [PDF] U.S. Patent Application 12/969,322, filed June 21, 2012.
  Excerpt:
  Methods and systems described herein provide for the creation of power and heated water utilizing a portable solar power generator and water heating system.
  
  According to one aspect of the disclosure provided herein, solar radiation is used to heat a liquid filled bladder. The heated liquid is used to heat stored water via a heat exchanger.
  
  The heated water is provided for use within these and other systems, or for general consumption.
  
  According to another aspect, a portable solar power generator and water heating system includes one or more photovoltaic collectors and one or more batteries. Sunlight (solar radiation) is collected by the one or more photovoltaic collectors.
  
  The collected solar radiation is converted to power for storage in a battery. The power is provided for use within these and other systems, heating water, or for general consumption.
  
  According to yet another aspect, both the liquid filled bladder and one or more photovoltaic collectors and batteries are utilized. Accordingly, heated water and power are provided for use within these and other systems, or for general consumption.

• Bainbridge, David A. THE INTEGRAL PASSIVE SOLAR WATER HEATER BOOK [PDF] Solar Usage Now 104 (1981). Retrieved 8/21/2013 (online free PDF format) http://www.mangus.ro/pdf/Manual%20incalzire%20solara%20pasiva.pdf [large file 104pp] - provided by www.builditsolar.com
  Excerpt:
  In 1909 Haskell's Improved Climax water heater met its match in the "Day and Night" solar water heater developed by William J. Bailey. This was a thermosiphon system, which reduced nighttime cool down by using separate collection and storage areas for solar energy.
  
  As events later showed, a thermosiphon system is not the only means for retarding night cool down; but the Climax heater manufacturers failed to develop this competitive feature in their integral passive heaters.
  
  They lost more and more sales to· the new thermosiphon system until they were out of the market.
• Butti, Ken, and John Perlin. A golden thread: 2500 years of solar architecture and technology. Cheshire books, 1980. Email John Perlin at johnperlin@physics.ucsb.edu
  
• Butti, Ken, and John Perlin. "Solar water heaters in California, 1891--1930." The Coevolution Quarterly;(United States) (1980).
  Excerpt:
  William J. Bailey refined the Improved Climax by making it into two separate units-solar heat collector and hot water storage tank. He called the system the Day and Night ...
• Kochendorfer, Frederick S., and Frank E. Wood. "Burner for hydrocarbon gases." U.S. Patent 2,220,247, issued November 5, 1940.
• Osterheld, Clark M. WATER HEATING SYSTEM [PDF] U.S. Patent 2,266,250, issued December 16, 1941.
  Excerpt:
  An object of my invention is to provide a relatively simple system comprising a minimum number of control elements effective to maintain in a heated condition a part of the water content . of a tank during one part of a day and to heat substantially all of the water in the tank during another part of the day.
• Shukla, Anant, D. Buddhi, and R. L. Sawhney. "Solar water heaters with phase change material thermal energy storage medium: A review." Renewable and Sustainable Energy Reviews 13, no. 8 (2009): 2119-2125.
  Excerpt:
  Bailey's system was the first to use an insulated storage tank relied upon the thermosyphon ... [... effect to heat water by circulating it through a solar water heating panel - Ed.]
• Wood, Frank E., and William G. Cartter. GAS HEATER [PDF] U.S. Patent 2,331,950, issued October 19, 1943. [Very similar to Baerman's patent from 1941, given above - Ed.]

 

Also see RANGE BOILERS still found in use in some buildings.

 

---

---

ADVERTISEMENT

---

---

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2023-09-23 by InspectApedia DF (mod) - 1969 JetGlas water heater data tag

@Anonymous,

That heater has worked well for many decades, how nice.

By 'acting up', what do you mean? Is it perhaps something worth fixing rather than replacing all together?

On 2023-09-23 by Anonymous

Here is my Jetglas- it's been acting up and I am considering replacing it although it still works. From this site, it looks like it was built in 1969! Same age as me.

On 2023-08-11 by InspectApedia Publisher - 1940s Day and Night water heater data tag

@Paul Virciglio,

Thank you so much for that excellent Day and Night water heater data tag - we will be sure to keep it with this article.

It looks as if that heater was made in the 1940s, during WWII, possibly as early as 1940.

On 2023-08-10 by Paul Virciglio

Removed this water heater from a house built in the 1920's.

On 2022-06-10 by InspectApedia-911 (mod) - is this a 1961 Day & Night Jetglas water heater from week 43 or week 12 or something else?

@Timsplumbco,

[Click to enlarge any image]

For an all-numeric Day & Night Jetglas Jupiter water heater, yours is a reasonable guess.

A second guess using digits #3&4 for YY and #5&6 WW would be 1961 week 43 - a reasonable guess.

A third guess using digits #3&4 for WW and #5&6 for YY would be 1941 week 61 which makes no sense (we've only got 52 weeks in a year)

So IMO your heater could be your guess (week 12 of 1961) or mine (week 43 of 1961).

Now let's do a context and sanity check: are the country and city of the home where this Day & Night Jetglas water heater is installed, and in what year was that home built?

Two points to consider, noting Jeff's similar Day & Nite water heater data tag discussed with reader Ned, 2022-01-21.

Jeff said his Jetglas heater was in service for "50 years"

Now note his SN begins with

430866

If digits #3-4 of that Sn - the 08 part - were the year then ... hold on: we know the Jetglas is older than 2008 and younger than 1908 ( the company in fact began operating in 1909). So on this data tag digits #3-4, the "08" won't be the year of manufacture.

Using the first two digits - 43- would put this heater's construction year at 1943- making it at 79 years old (possible but unlikely)

Using the last of Jeff's Jetglas heater S/N - 66 - would put the heater's year of manufacture as 1966 - a reasonable guess and in that "50 year old" ballpark age he was giving.

So from Jeff's example, an all-numeric Jetglas Day & Night water heater with a data tag looking like yours and his, would be the format

NNWWYYwhere WW is the 2-digit week of manufacture and YY is the 2-digit year.

On 2022-06-10 by Timsplumbco - tell me the date of this Day & Night water heater?

Hello;

Can you tell me the date of this Day & Night water heater?

It's "Registration No. is: 126143 553215.

Photograph of label is attached.

I am guessing that it's the 12th week of 1961.

Thanks.

Tim

[Photo above]

Reader follow-up: Ned Said: Day & Night Jetglas water heater 50-year life!

One thing to add about the tank/label is the house here was built in 1970(1) or so, and as far as I know, the water heater was never replaced.

Its just been chugging along for 50+ years, apparently. I guess those old Jetglas ads were accurate - it really has lasted twice as long as other water heaters. - 2022/01/22

On 2022-01-21 by Inspectapedia Com Moderator (mod) - more history of the Day & Night Water Heater & HVAC Company

@ned,

Thank you for the helpful question and Day & Night water heater data tag - we'll be sure to add that to the article above as it'll help other readers.

Yes, I suspect - but don't actually know - that the Day & Night Water Heater "registration no" shown is or was equivalent to a serial number, perhaps registering the heating elements?, and was data that would have been entered in a warranty registration.

Your Day & Night Jetglas Jupiter-model water heater was the product of William J. Bailey's Day & Night heater company..

For most electric water heaters, one of two standard water heater element designs can usually be found in a generic form that will work just fine.

See ELECTRIC WATER HEATER ELEMENT REPLACEMENT

On 2022-01-21 by ned

I have a Jetglas JRD-2 30 gallon electric water heater and the only label I see (at about chest height) has a registration number on it, is that the same as the serial number? This heater is very old, possibly from the early 1970s.

Reg # 430866 564593

The heater is having issues making hot water, so I am trying to test the elements to see if they are working or not (one out of two is, apparently). The elements are 4500 watt, max amp rating of 21.7.

Are there standard elements that can be swapped for the old ones? Thanks in advance for any info.

[Photo of Day & Night Jetglas water heater data tag - above]

On 2021-01-30 by (mod) - Gas fueled Day & Night heater won't stay lit.

Not necessarily, Roberto; A pilot light problem doesn't mean the heater is at end of life;

Try replacing the thermocouple - details are in

THERMOCOUPLE REPAIR / REPLACEMENT

On 2021-01-30 by Roberto Amaya

Pilot light will not remain lit. Unit is approximately 20 years old from date of inspection for installation.

Time to buy a new water heater?

...

Continue reading  at WATER HEATER LIFE or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Or see these

Recommended Articles

• AGE of HEATERS, BOILERS, FURNACES
• AGE of PLUMBING MATERIALS & FIXTURES
• BRADFORD WHITE WATER HEATER AGE & MANUALS
• SOLAR WATER HEATER ANTIQUE - more on the history of solar water heaters
• WATER HEATER AGE DECODING GUIDES - six methods for figuring out the age of a water heater
• WATER HEATER AGE & MANUALS - home
• WATER HEATER LEAK REPAIR
• WATER HEATER LIFE
• WATER HEATER RESET BUTTONS & CONTROLS
• WATER HEATER WARRANTIES

Suggested citation for this web page

JETGLAS Day & Night WATER HEATERS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

Or see this

INDEX to RELATED ARTICLES: ARTICLE INDEX to WATER HEATERS

Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia

Ask a Question or Search InspectApedia

Questions & answers or comments about how to find out the age of a heating appliance: water heater, heating boiler, heating furnace.

Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

Note: appearance of your Comment below may be delayed: if your comment contains an image, photograph, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Apologies for the delay.

Only one image can be added per comment but you can post as many comments, and therefore images, as you like.
You will not receive a notification when a response to your question has been posted.
Please bookmark this page to make it easy for you to check back for our response.
Our Comment Box is provided by Countable Web Productions countable.ca

Citations & References

In addition to any citations in the article above, a full list is available on request.

---

ADVERTISEMENT

---