Been doing a bit of reading about TPI. Currently when my old roomstat turns off the boiler after CH demand is satisfied my pump shuts down immediately and there is no overrun.
When I replace the roomstat with a BDR91 to close the heating relay, if Evohome starts using TPI to reduce demand, will I need to add pump overrun? I'm assuming the pump live wire from the boiler simply hasn't been wired in (assuming the boiler supports overrun, it's a Viessmann Vitodens 100 WB1B open vent boiler)?
When I replace the roomstat with a BDR91 to close the heating relay, if Evohome starts using TPI to reduce demand, will I need to add pump overrun? I'm assuming the pump live wire from the boiler simply hasn't been wired in (assuming the boiler supports overrun, it's a Viessmann Vitodens 100 WB1B open vent boiler)?
Comment