We work to combine energy efficiency, safety and comfort so that you can stay toasty in the winter and still have money left for presents. Simsbury rd, avon, ct 06001 |. Whatever you’re looking for, you’ll find the solution with us at ctc. This month's tastiest seasonal produce. The boiler is clearly the largest investment and the next highest cost is the installation itself a two-man, day-long job installation will cost at least £500. Each generator is insulated with.