Age of heating equipment & Systems:
How to determine the age of your heating system and components. Here we provide several excellent sources for de-coding the data tag information on heating equipment.
This article provides documents that explain and translate all of the data found on information tags and stickers used on heating & heat pump equipment, including equipment age, heating capacity, electrical requirements, and operating characteristics.
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HVAC data tag decoding guides: For help in decoding air conditioner, boiler, furnace, heat pump, water heater data tags and determining the age, model, or specifications of that equipment, see
AGE of HEATERS, BOILERS, FURNACES [this article]
AGE of WATER HEATERS There we provide documents with extensive equipment data tag decoding information. This article series answers most questions about all types of heating systems and gives important inspection, safety, and repair advice.
We provide links to individual manufacturer's data tag decoding guides (Lennox, below), and to two excellent equipment data tag decoding books, by Scott LeMarr (online at this website) and the Carson Dunlop & Associates Ltd. Technical reference - the most extensive such document we've found.
For many heating or cooling equipment manufacturers, especially after 2000, decoding the equipment tag to obtain the age of the device is pretty easy.
Here is an example of data tag age decoding for Peerless Heating Boilers: If the boiler was manufactured from 1984 to 1999, the serial number ends in a four digit date code. “123456-1284” would be manufactured in December, 1984. If the boiler was manufactured from 2000 to present, the serial number ends in a six digit date code. “123456-200505” would be manufactured in May, 2005.
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1. Lennox HVAC products Age: see our Lennox Heater & Air Conditioner Model & Serial Number Decoding Guide at this website. Also see
2. FURNACE AGE DECODING CHART provided by home inspector Scott LeMarr has generously shared his FURNACE AGE DECODING CHART document that decodes both furnace age for many brands of water heater, including hot water systems produced by the following manufacturers. [PDF linked to return here. You can also use the "BACK" button on your browser to return to this page at InspectAPedia.com.]
LeMarr's document provides decoding data for the following manufacturers: Ambassador water heaters, American water heaters , ACE water heaters, A.O.Smith water heaters, Apollo, Aqua Temp, Aqua Therm, Best water heaters, Bosch water heaters, Bradford White, Cafos, Champion, Crosley, Energy Saver, Envirotemp water heaters, GE water heaters, Glascote water heaters, Golden Knight water heaters, GSW, Hotpoint water heaters, JC Penny, Jetglas, JW or John Wood, Kenmore water heaters (Sears Brand), Lochinvar, Lowes, Mainstream, Maytag water heaters, Montgomery Wards, Knight, PermGlas, Reliance water heaters, Revere, Rheem water heaters, Rheem/Rudd/Richmond water heaters, Rinnai, Security, Shamrock water heaters, Standard water heaters, State/Reliance/Sears brand water heaters, Thermo-King, Vanguard water heaters, US Craftsmaster, US Water Heaters, and Whirlpool water heaters.
Carson Dunlop Associates' Technical Reference Guide (below) provides the most extensive HVAC equipment data tag decoder & other information to determine the age of boilers, furnaces, water heaters, air conditioners, and heat pumps by decoding the product serial number.
For the most complete and very detailed HVAC equipment data tag and age decoding information anywhere (about 128 manufacturers & brands)
Carson Dunlop, Associates, Toronto, have provided us with (and we recommend) Carson Dunlop Weldon & Associates' Technical Reference Guide to manufacturer's model and serial number information for heating and cooling equipment
Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page "Promo/Redemption" space.
The Carson Dunlop Technical Reference Guide provides both equipment data tag decoding data and also manufacturer contact information as well as historical dates for many brands of heating and cooling equipment. Included in the manufacturers listed are also makers of ancillary equipment such as controls, circulator pumps, etc., not just boilers, furnaces, and heat pumps themselves.
The age of a heating boiler, furnace, or heat pump can be determined by identifying its year of manufacture that is encoded in the unit's serial number (not the model number). The guides above give heater serial number decoding for each manufacturer and type of heating appliance.
For example, when decoding the age of an H.B. Smith heating boiler one of our readers provided the following from his boiler's data tag:
H.B. Smith, Westfield MA
Boiler Model # G200-W-5CON
Serial # J80-2747
For an HB Smith boiler the age is typically the two digits following the letter at the beginning of the serial number. In this case the "80" following the "J" tells us that the boiler was manufactured in 1980.
Later H.B. Smith boiler serial numbers use the format XXyyyy-nnnn where yyyy will be the four-digit year of manufacture.
Aaon, Inc., Ack-O-Matic ,Aero Burners, Aero Environmental, Airco, Airtemp and Tempmatic, Aitons' Equipment - APCO, Allanson Transformers, Amalgamated Electric, Amana, American Standard, American Standard Water Heater Group, Amtrol, Anthes, APCO, ARCO Air, Arkla Industries, Armstrong Air Conditioning Co., S.A. Armstrong, Baltimore Aircoil of Canada, Bard, Bell & Gossett, Borg-Warner, Bradford White, Bristol Compressors, Bryant manufacturing Co. of Indianapolis, Buffalo Package Equipment, Bulloch, Burke Water System Industries, Burnham Corporation, Canadian Tire Corporation, Carlyle Compressor Company, Carrier, Chromalox Canada, Chrysler, Clare Brothers, Clare Mega Save, Clare HECLA, Clawsey-Sohrt Manufacturing Co., Climate Control Products, Climate Master, Climatrol, Coleman, Comfort Aire, Copeland, Copelaweld Compressors, Crane, Davie Environmental Equipment, Day-Nite, DMO Industries, Ducane Heating Division, Dunham Bush, Duomatic, Economite, Elect-Aire, Electric Apparatus COmpany, Elliot, Emerson Electric Company, Enmar Enmar Systems, Envirotron, Esso, Evcon Industries, F.P. Industries, Fairbanks Morse, Fedders, Fess, Findlays Limited, Flamemaster, Fleetline, Florida Heat Pump Manufacturing, FMC Corporation, FP Industries, Franklin Electric Company, Frick, Friedrich, Frigidaire, Frigiking, Fuel Master Burners, G.M.L. Manufacturing, GSW Inc., Galais Manufacturer, Galaxy Boilers, General Controls (ITT), General Electric, Gilbarco, Gilbert and Barker, Goettl, Good Cheer, Goodman, Grimsby Stove and Furnace Ltd., Heat Controller Inc., Heil, Hill York, Hitachi, Homart, Honeywell, Howard Furnace and Boilers, Howell Electric Motors Company, Hydrotherm Inc., I.C. Burners, ITT, Inglis, Inter City Gas (I.C.G.), International, International Comfort Products, Intertherm, Iron Fireman, Janitrol Heating and Air Cooling Conditioning, John Wood Co., Johnson Air Ease, Keeprite, kenmore, Koldwave, Kool-Fire, LG, The Arthur S. Leitch Co., Lennox Industries, Lincoln, Louis Allis Company, Luxaire, Magic Chef Air Conditioning Co., Mgnatec, Marathon Electric, Marcus Transformer, Marley Cooling Tower, Marvair, McLary, McQuay International, Mestek, Metzger, Metropolitan Oil and Gas Industries, Mid Continent Metal Products Co., Miller, Mitsubishi, Modine, Mueller, N'Furno, Nordyne, Norseman Boilers, Oakwood Iron Works (OIW), Olsen, Payne, Pendell Boiler Ltd., Philco, Powermatic, Precision Boilers, Preston, Pyreco, Raypak or Raypak, RBI Water Heaters, Refcan, Reznor ITT, Rheem, Roberts Gordon, RUUD, Sanyo, SJC Corporation, Scarboro Pump Manufacturing Co., Sears, Sears Roebuck, Severn Boiler, Simpsons-Sears, Shell, Singer, Slant Fin Ltd., A.O. Smith, H.B. Smith Co., Smith Boilers, Snyder General Corp., Spacepak, Spencer Boilers, State Industries, Sterling HVAC Products, Sun Dial Manufacturing Inc., Sunscan Compressors, TACO (Canada), TACO, Tappan, TECO, Techumseh Compressors, Teledyne Laars, Tempmatic, Temprite, Tempstar, Thermo Pride, Trane, Typhoon, Unitary Products, viessman, Viking, Warden King, Water Furnace, Watts Regulator Co., Weben jarco, Weil-McLain, Westinghouse, Whirlpool, White-Rodgers, Wood, Worthington Air Coils Ltd., York - Borg Warner.
Indoor heating methods by historic periods or years: (adding date ranges is continuing for the list below - Contact Us to contribute).
Our photo (left) shows a gravity warm-air "octopus" furnace; in its earliest version these furnaces, installed in the late 1800's in the U.S. were coal fired; many were later converted to oil.
Gravity furnaces rely on natural convection (warm air rises) to deliver heat to the occupied space. There is no blower fan in the system. In their simplest design, the gravity furnace system included no ductwork whatsoever. Rather a large grate was provided in the building floor just above the furnace itself. In a multi-story house, heat rose to upper floors by passing up the stairwell or through open registers in first floor ceilings.
The gravity furnace we show at left was a more advanced design in which an "octopus" of duct work "arms" delivered heat directly to individual areas of the building.
The furnace in our photo is taking much of its "return air" from the basement - a very expensive way to heat a home. Earlier models eschewed ductwork and instead fed heat into the first floor of the building through a large central grate in the floor immediately above the furnace.
If you don't know what kind of heat your building uses, we explain how to figure out the answer at HEATING SYSTEM TYPES.
Beginning at HEATING SYSTEMS - home we discuss different types of heating systems such as
We also discuss various heating appliance fuel types (coal, oil, gas) as an aid in determining the age of a home or other building.
I just bought a home in California. It has a dual sided, vent less, gas floor heater.
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The only name I see is " Royal Heater". there are 2 valves; one for burner, one for pilot.
You need a key to turn them. On top of the unit is a view finder cap. Inside it looks like a 3 burner pilot
. I have attached photos of it. I'm trying to find any information on it. thank you.
[This particular heater] works beautifully and has been inspected. I want to find a operator's manual so I can maintain it.
- G.L., 16 Jan 2015
The Royal brand in-floor gas heaters were originally designed in California in the late 1920's - we have a patent (Publication No. US1666367 A) by Louis Clausing (Burlingame CA) assigned to the Royal Metal Works (his own company held in partnership with Max Schwartz0 describing an earlier version of the product dated 1928: "Heating device." U.S. Patent 1,666,367, issued April 17, 1928.
Your photos below illustrate the interals of this floor-wall gas heater.
That that company was Royal Metal Works, 238 Van Ness Ave, in San Francisco, CA. That patent was cited by other product patents between 1943 and 1982.
Below at left your photo shows the gas controls including main valve (left) and pilot valvce (right-hand stem). At below right you've shown the pilot flame (I think).
The company filed just three patents, two for heaters and one for metal bending:
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There is presently a [different] California Royal Metal Company (in fact several of them)
who might be able to give you more historical data, is a sheet metal fabricator whose business was established in 1981 but who may have known of the older Royal Metal Works who made your heater:
Ted Rieck Enterprises Inc,
1228 South Wright St
Santa Ana, CA 92705
Phone: (714) 542-4763
Unless you object, I'll add your photos to data we have at InspectApedia and will leave you anonymous (our default) unless you let me know that you want to be identified. That may attract comment from other readers who have similar products.
I'll attach the documents of interest to this article.
Watch out: I would not assume that the heater you have is safe to use without both a thorough visual inspection and testing for gas leaks as burning LP or natural gas in a defective appliance can produce fatal carbon monoxide gas. I would suspect that your device may also lack safety features of modern gas heaters. If you are going to ignore my timid warnings then at least be sure you have working CO and smoke detectors properly located and installed.
Other antique wall heating convectors are shown at WALL CONVECTORS HVAC
If the heating equipment in your building is original - which may be determined by visual inspection, by knowing the building age, or knowing the heating system age, then each of these can inform us about the probable age of the other.
For example, an original Flamemaster (or Climatemaster) gas fired heating furnace is probably 40 or more years old even if you cannot find the date code in the furnace serial number.
Watch out: Names and who is using them can change over time: for example the name "Flamemaster" appears on other products such as sealants, coatings and packaging produced by Flamemaster in Pacoima California, US - not a heting equipment manufacturer. The product line Flamemaster gas furnaces shared product designs with ClimateMater. ClimateMaster continues in business (in 2015) as a manufactuer of geothermal heat pump systems.
Continue reading at AGE of HEATER BOLER FURNACE FAQs - Q&A on decoding specific brands of heating equipment via serial number, or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.
Or see AGE of a BUILDING
Or see FURNACE AGE DECODING CHART - PDF
Or see Lennox HVAC products Age PDF
Or see these
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Questions & answers about decoding the age of specific heating furnaces or boilers are found at AGE of HEATER BOLER FURNACE FAQs
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