Every contractor i talked to said this is the best boiler they have installed! Turn off the electricity at the circuit breaker use a circuit tester to make sure the power is off use tape to mark the wire connections and disconnect the wires. We can help supply a variety of products for all of your heating and cooling needs from kohler and lennox to grundfos and maxx, we have it all and much more! Find a baxi installer near you for a free quote. Kurt.