I gave up using Epson printers here in Spain as the ink would dry out very quickly in summer and I was using more ink to clean the heads than to print. I've now had an HP printer sitting on the desk for two years and not had to clean the heads once or had any problem with inks drying/clogging.
Incidently before dumping the Epson I wrote to them about the problem: I wish I'd kept their answer as it was a classic bullsh*t who-cares-about-customers letter.