I have a Valiant, 3 years old now. Just had it serviced by the plumber who installed it...he said there was no need to pay every month, by the time if and when it went wrong that money would buy a new boiler. PLUS, if you're old enough the Government are doing the replacement boiler///cavity walling// loft insulation for free, or boilers with huge discounts. Last year my service was £64...this year (last month) it was £65. hth