I have recently had a thirty year old boiler replaced with a Vaillant ecoMAXplus 18e boiler. The company that fitted the boiler altered the original pipe work and I believe the flow is in the wrong direction through the boiler. The system is fitted with a Grundfos TF110 pump, can anyone please tell me what direction the flow is when looking at the pump with the writting up the correct way, does the water come in the bottom and out the top or the other way round. also there are two motorised valves (honeywell) is it important that that the flow is as indicated by the cast arrow on the valve body ?. I can not see a arrow on the pump.