We report detection of single nucleotide polymorphisms (SNP) by melting curve analysis (MCA) on DNA microarrays in a plastic microfluidic system with integrated heaters using lamination foils. Thin-film copper microheaters were structured on polyethylene napthalate (PEN) foil and DNA microarrays were printed on the heater foil. The system was integrated in a microfluidic channel and successful detection of SNPs was demonstrated. Thermal and electrical characterization of the system was performed proving that the recently implemented low-cost heater encapsulation method using a simple single-sided adhesive foil has not affected the systems performance relative the previous Parylene C encapsulation.