The single most important thing to making good coffee is the water temperature during brewing. It should be just off the boil, about 205°F or 96°C. To achieve this requires a potent electric heating element, about 1300 to 1400 Watts. As you might expect, this costs money. You probably will not like the price of the best electric drip coffee maker that I know of, made by
Technivorm Moccamaster, which now sells in the US for $310. I have one, which I use daily, and has lasted well over 12 years.
Coffee brewers handmade in the Netherlands out of high-quality, sustainable materials, built to last a lifetime. Dedicated to seeking the real taste of coffee.
technivorm.com
Most cheaper coffee makers use 1000 to 1200 Watt heaters, and heat water only to roughly 180°F or 82°C. During brewing, the lower heat actually produces bitter, poor tasting coffee. Most people respond to this by using fewer coffee grounds, resulting in weak but bitter coffee. These cheaper coffee makers usually don't last long. Those I've used in the past never lasted more than 2 or 3 years.
Is the thermal carafe on your present coffee maker lined with plastic? It should be glass or stainless steel.
Most plastics manufactured today have eliminated BPA, especially if they will be exposed to hot water. BPA additives were meant to keep plastic flexible, especially if the plastics were meant to be used at lower temperatures. There are now better additives that keep plastic containers flexible at low temperatures.
I highly doubt if you or anyone else can smell BPA.