Rheem RGDA-075C-ER

______________________________________________________________________ I have a rheem furnace, model RGDA-075C-ER. Has anyone ever heard of this model number? Why is it so scarce? I have searched this website, and the internet, but can not find a source of information on my furnace. It was installed in 1990, it works well, but I want to find SEER rating on it, etc. I may consider replacing it for a more efficient model, if it could save me some money in utility bills. What advice can you give me? Thank you Tom Replies: Mastertech “Re(1):Rheem RGDA-075C-ER” , posted Fri 28 Jan 18:38 ______________________________________________________________________ RGDA-075C-E is a 1990ish 63.5%(Bad – builder grade) Yea you could do alot better. I like the 2 stager myself, If u use heat alot then go with the 90% else stick to a 2stage 80%. fish “Re(1):Rheem RGDA-075C-ER” , posted Thu 27 Jan 10:01 ______________________________________________________________________ The Model number could be different than first noted, RCDA-075C-ER The difference being the second character ‘G’ may be a ‘C’, which really looks like a G to me on the model/serial plate of my unit, but by now I am just grabing straws to solve this mystery. Thank you Tom mbales “Re(2):Rheem RGDA-075C-ER” , posted Thu 27 Jan 16:55 ______________________________________________________________________ The second number is not a Furnace model number. The RC is a Rheem Coil model number. And SEER doesn’t apply to furnaces. So it would be RG (Rheem Gas) – 75000 BTU / HR input. Take one of the covers off, find the manufactures label, and find the BTU Output. Divide Output (say 57K) by Input 75K and your AFLU is 76%. fish “Re(3):Rheem RGDA-075C-ER” , posted Thu 27 Jan 18:17 ______________________________________________________________________ Thanks for the formula, I found the manufacturers label, found the 75,000 BTU input, but nowhere can I find anything that resembles and output value. What do you suggest? Maybe they were too embarassed to print the output value? I called Rheem customer support in Arkansas, but it was after 5 pm, I suppose I can call tomorrow. Thanks for the reply mbales Thank you Tom fish “Re(4):Rheem RGDA-075C-ER” , posted Fri 28 Jan 09:18 ______________________________________________________________________ Just got off the phone with the Rheem customer service center in Arkansas. This is not good. They tell me the output is 56,000 BTU, and looks like my efficiency is 56000/75000 = 74.6%, but with the standing pilot light my efficiency effectively is 63.5%. Oh boy. Does everyone agree that I should replace my furnace with a more efficient new furnace? Thank you for your recommendations. Tom Thank you Tom mbales “Re(5):Rheem RGDA-075C-ER” , posted Fri 28 Jan 18:25 ______________________________________________________________________ Did they say the efficiency is that low with the pilot light on? In that case a newer 80% would have a decent payback no matter where you lived almost, and 90% would be really quick. Normally, the colder it is, the quicker your payback on the high efficiency furnace (as long as it’s not oversized). I did the math for my KC, KS area (don’t have figures with me), and the difference between 80% and 90% price and my usage made the payback too far out – especially so if you factored in the FACT that 90%’s have need for more repair or parts, and there are more parts to break down, with the average price being higher. For me a 2 stage 80%, maybe $200 more, made more sense. Fish “Re(6):Rheem RGDA-075C-ER” , posted Fri 28 Jan 18:32 ______________________________________________________________________ Hey mbales, thanks for the comments. i live in ohio so i think that my payback may be pretty quick, and i agree that an 80% furnace would be a huge difference for me. Are you saying that the 90%+ furnaces are too finicky? and need frequent repairs? i was all excited about possibly getting a 90% furnace, but your comments have me concerned. If you get a chance could you explain your viewpoint on the 90%’ers? Thanks. Thank you Tom mbales “Re(7):Rheem RGDA-075C-ER” , posted Sat 29 Jan 02:50 ______________________________________________________________________ The mere fact that the condensing 90%’s are more complex – more parts – more places for a break down, less tolerances for error. And the parts usually run a tad higher, and troubleshooting can be more interesting. Consumer Reports had an informal survey from HVAC contractors that found, in order of furnaces with issues – 1/3 contractors had the most efficient units (95% or above) needed more repairs. 1/2 found new models need more repair. Many found the lowest efficiency 78% below more likely to need repair. These general findings are born out from HVAC installers / repairmen I know. Though they have commented the 90/92%’s are getting better. While it’s true the biggest factor is the installer (cheap units can be installed very well and last, or expensive units can be thrown in and have issues) – issues can still come up. Since you are in an area where payback would be quicker, a 90% unit installed by a good contractor would probably be decent. Keep in mind the following makers. United Technologies Corp (UTC) owns Carrier/Bryant/Payne and International Comfort Products (ICP) which makes Heil/Tempstar/Acroaire/Comfortmaker. Rheem / Ruud together. American Standard / Trane together. York / Luxaire / Coleman. Lennox / Armstrong. Nordyne makes Frigidaire/Gibson/Tappan/Westinghouse. Goodman / Janitrol together. And Consumer Reports latest owner survey found for repair history the number repaired – (these % are estimated from a graph, but the order is correct). American Standard 15% Rheem 16% Trane 16% Ruud 17% Bryant 17% Carrier 18% Heil 18% York 19% Amana 19% Lennox 21% Tempstar 22% Goodman 25% Fish “Re(8):Rheem RGDA-075C-ER” , posted Sat 29 Jan 15:50 ______________________________________________________________________ thanks mbales and mastertech. great posts, they help. Now my question goes to the installation. I got a 28″ x 14″ x 46″ unit in the house now, how do i match up a smaller unit to existing duct work? How do you like the RGPN Rheem series furnace? Where can i purchase the furnace only? Thank you. Thank you Tom Xenos Webmaster “Re(4):Rheem RGDA-075C-ER” , posted Fri 28 Jan 07:05 ______________________________________________________________________ Could be called bonnet capacity. What ever it’s called it’s on the name plate. Xenos. The best way to escape a problem is to solve it. fish “Re(5):Rheem RGDA-075C-ER” , posted Fri 28 Jan 08:46 ______________________________________________________________________ Ok, I will look for that term on the plate later tonight. thx. Tom Thank you Tom