Seems as though, when my hot water heater fires up by the furnace (Energy Kenetics system 2000) my one zone valve is staying open allowing hot water to enter the baseboard heating run. This is with the heating controls (on the thermostat off or on and the setting well below automatic) Is it just me or does everything seem to work against us. Two questions- There is a manual gate type valve directly above the zone valve. If I shut this manusal valve, is there any compromise I should be concerned with? It's a Invensys pop top control valve # vt2317g13a030 I was quoted $200 just for the valve. Does anyone know of a replacement that is less costly? I will install it myself.