Electric combi boilers company, green acres, oakley green road, windsor, sl qf. We have been serving the city of chattanooga and the north georgia region for over years! There is a big difference between electric boilers and. From sinks and toilets to sump pumps and frozen pipes, there's no household plumbing job beyond our expertise! Despite these advantages however, there are some situations in which a gas combi boiler is not necessarily the best choice let’s take a look at a few.