Browse these emergency plumbers with great ratings from thumbtack customers in boston. Sl series g3 – residential & commercial condensing boilers featuring the latest in condensing technology. This product is suitable for your sink, bath or shower drain but not an outside drain. Mon – fri: 8 am – 5 pm, sat: 8 am – 12 pm. With over 40 years’ experience in the plumbing field and equipped with the latest drainage.