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Wheatstone Concertina Ledgers
Directory: Historical business records of C. Wheatstone & Co. fromthe Horniman Museum in London. Earlier ledgers from the Wayne Archives contain company sales records from the late 1830s to the 1860s along with production records from the 1860s to the 1890s and some early records of wages and other payments. Later ledgers from the Dickinson Archives contain production records from 1910 to 1974. All surviving ledgers have been digitized (some 2,300 pages in total) and made available free on the web for private research. The same material is also available to buy on an inexpensive CD.Includes an introduction to the project by Margaret Birley, Keeper of Musical Instruments atthe Horniman Museum, and an article by Robert Gaskins describing in detail how the ledgerswere digitized.; Posted 15 June 2003; Updated 15 June 2005; » go to directory

Serial Number Muddle in Early Wheatstone Ledgers
by Wes Williams: A major contribution to the muddling of serial numbers in the early ledgers is that multiple ranges of serial numbers are in use at any one date, and this is further complicated by instrument exchanges and hires. The multiple ranges begin as a feature of sales before 1850, but after that the multiple range-lines dominate the structure of sales, with many simultaneous ranges extended over longer periods. Scatter-plots ofserial numbers and dates transcribed from the Wheatstone Ledgers reveal the pattern.This is a preliminary version dealing only with thefirst four ledgers (to early 1854); the completed article will appear soon.; Posted 15 December 2005; » read full article

Wheatstone English Concertina Pricelists
collected by Chris Algar: Most of these pricelists were found in old concertina cases. From internal evidence it ispossible to date the lists c. 1915 to c. 1965 (plus one very early pricelist dated 1848,from the collection of the Horniman Museum, and a list published as an advertisementin a trade directory in 1859). These lists contain information about Wheatstonemodel numbers and descriptions which are useful to interpret the Wheatstone Concertina Ledgers.See also Duet pricelists from Wheatstone.See also Anglo pricelists from Wheatstone.; Posted 15 May 2003; » go to directory

Wheatstone Anglo Concertina Pricelists
collected by Chris Algar: Most of these pricelists were found in old concertina cases. From internal evidence it ispossible to date the lists c. 1910 to c. 1965. These lists contain information about Wheatstonemodel numbers and descriptions which are useful to interpret the Wheatstone Concertina Ledgers.See also English pricelists from Wheatstone.See also Duet pricelists from Wheatstone.; Posted 15 February 2003; » go to directory

Wheatstone Duet Concertina Pricelists
collected by Chris Algar: Most of these pricelists were found in old concertina cases. From internal evidence it ispossible to date the lists c. 1910 to c. 1965 (plus one very early pricelist for Double duets c. 1850). These lists contain information about Wheatstonemodel numbers and descriptions which are useful to interpret the Wheatstone Concertina Ledgers.See also English pricelists from Wheatstone.See also Anglo pricelists from Wheatstone.; Posted 15 February 2003; » go to directory

Ladies in the Wheatstone Ledgers: the Gendered Concertina in Victorian England, 1835–1870
by Allan W. Atlas: This study looks at the 978 women for whom there are 1,769 transactions—about 12% of thetotal—recorded in nine extant Wheatstone & Co. sales ledgers that list the firm’s day-to-day salesfrom April 1835 to May 1870. It is in two parts: (1) an Introduction, which analyses the data presentedin the Inventory from a demographic-sociological point of view and places Wheatstone’s commercewith women into the context of its business activity as a whole; and (2) the Inventory (withthree appendices), which lists every transaction for each of the 978 women, identifies as many of themas possible, and offers a miscellany of comments about both the women and the transactions. Royal Musical Association Research Chronicle v. 39 (2006). 239 pages.Briefly,the roster of Wheatstone’s female customers reads like a list of Victorian England’s rich-and-famous:the Duchess of Wellington and 146 other members of the titled aristocracy (more than twice as manyas their male counterparts), the fabulously wealthy philanthropist Angela Burdett Coutts, membersof the landed gentry, and such mainstays of London’s musical life as the guitarist Madame R. SidneyPratten, the organist Elizabeth Mounsey, and the contralto Helen Charlotte Dolby, as well as a largenumber of Professors of Concertina.; Posted 21 March 2007; » read full article

Calculate Modern Values of Historic Concertina Prices
by Randall C. Merris and Robert Gaskins: “How much would that be in new money?”An interactive calculator to convert sterling values from anyyear 1830–1999 to the equivalent value in the year 2000.The calculation preserves the relation between the chosen value and“average earnings” for the two dates; this method makes itappropriate for converting wages and capital sums, and also forexpensive discretionary products such as concertinas. The calculator dealswith both “old money” (prior to 1971) and the later decimalizedcurrency. It is especially useful for understanding historical documents suchas old advertisements and pricelists, and the sales prices and wagesrecorded in the Wheatstone Concertina Ledgers from the Horniman Museum.; Posted 01 January 2005; » read full article

Horniman Museum
the Horniman Museum: The Horniman Museum in London is home to the largest collection of concertinas(more than 600 instruments) and much related archival research material. Aphotographic directory of concertinas in the collection is available on the site. The Wheatstone ConcertinaLedgers at the Museum have been digitized and are onlineat a separate website.; Posted 15 April 2003; » go to website

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© Copyright 2000– by Robert Gaskins

Since you probably understand that appliances don’t last forever, one of the first questions you’ll ask yourself when something goes wrong is, “How old is my water heater?“.

You may be wondering if repair or replacement is the best option or even if you’re still covered by the manufacturer’s warranty.

If you’re the type who saves every purchase receipt for decades, you probably don’t need to read this. If you have a newer model, the water heater age is sometimes clearly printed on the manufacturer’s label affixed to the unit.

For everyone else, keep reading to see how easy it is to find your water heater’s manufacture date. All you need is to know who manufactured the water heater and its serial number (both found on the label affixed to the water heater).

Alternatively, you can check your manual to get a rough estimate on age based on the copyright year. You can access online versions of most models of the three most popular brands at these links:

Manufacturer vs Brand

Propane Tank Ownership Proof Form

Get a free estimate online from top local home service pros in your area.

Note: This post may contain affiliate links. This means that at no cost to you, we may receive a small commission for made purchases.

Before going further, I want to point out the differences between a water heater manufacturer and a water heater brand. The manufacturer is the company that takes materials or components to create (or manufacture) the water heater.

The brand on the other hand is what the water heater is sold (or branded) as to customer. A small number of manufacturers create water heaters which are then sold under dozens of different brands. For instance, even though the water heater you bought from Sears says Kenmore on it, it’s still manufactured by Rheem.

So, how old IS my water heater?

Below are serial number lookup sections for every major water heater manufacturer. Column one lists all the various brands that manufacturer makes, column two shows sample serial numbers, and column three of each table acts as a serial number decoder.

A.O. Smith Water Heater Age