E-tec plus is our newest combi boiler range with 7 year warranty as standard. We offer solutions for all of your commercial plumbing needs! Registered in england & wales no 7814907. Friars bridge court, 41-45 blackfriars road, london, se1 8nz. While it may seem like a small deal, a clogged drain is a household emergency requiring prompt attention why? because if left unchecked, continued.