I bought a house in June that has a combi boiler and a seperate additional pump that the previous owners had wired on a plug In timer. The boiler is a vaillant ecotec and is approx 7 years old. Clearly the use of a secondary pump like this is a bit of a bodge job. Is there any way I can normalise it? Do vaillant offer a slave pump controller that would trigger the second pump only when the main (built in) pump is triggered?