Effective and environmentally friendly! Is available in three models, where the kw model is the most powerful, providing up to . l/min of hot water, in domestic hot water heating mode. Are you looking to repair or replace an oil furnace? do you need help maintaining an older boiler or an expert who can help you decide about upgrading your home heat? Welcome back just a moment while we sign you in to your goodreads account. Sign up now to stay updated on the latest.