To request a service appointment and we’ll be the. Keep container tightly closed in a cool place and store bottle upright. New gas, oil & lpg boilers with a 7-10 years manufacturers parts and labour guarentee & free quotations. So, wondering what would be the best option for you? when it comes to heating up water for example, regular boilers are considered the more favourable option however, a combi boiler might be more efficient for you because it.