G
Graham W
Hi,
Please can anybody help with why my CH system does not produce enough hot water when the boiler is required at the same time to provide heat to the underfloor heating? More details here :
1. If the CH is programmed to just provide HW then running it for an hour in the morning produces plenty of HW for the two usual occupants of the house to have showers etc in the morning and leaves plenty of hot water for use throughout the rest of the day.
2. But if the CH is programmed to run for say two hours in the morning but to provide for both HW AND the UFH then once the two of us have had showers there is no hot water left in the tank for the rest of the day.
3. It’s been like this since we moved into the house in April 2021.
I’ve given some details of the house and system below.
Thanks.
Graham
• 2011 build house – modern, very well insulated.
• UH heating to ground floor. Rads and electric UF heating upstairs.
• Vaillant ecoTec Plus Gas boiler- serviced January 2022 and everything fine.
• Main unvented 300L cylinder. Cylinder stat set at 60C. Motorised valve seems to be working fine. Expansion tank checked Jan 2022 and repressurised – was well down before that.
• There is a secondary return pump which seems to be working fine and is timed to run in AM when CH working and when there is demand for showers.
• Mains pressure is excellent.
• Flow out of the taps is strong – H and C.
Please can anybody help with why my CH system does not produce enough hot water when the boiler is required at the same time to provide heat to the underfloor heating? More details here :
1. If the CH is programmed to just provide HW then running it for an hour in the morning produces plenty of HW for the two usual occupants of the house to have showers etc in the morning and leaves plenty of hot water for use throughout the rest of the day.
2. But if the CH is programmed to run for say two hours in the morning but to provide for both HW AND the UFH then once the two of us have had showers there is no hot water left in the tank for the rest of the day.
3. It’s been like this since we moved into the house in April 2021.
I’ve given some details of the house and system below.
Thanks.
Graham
• 2011 build house – modern, very well insulated.
• UH heating to ground floor. Rads and electric UF heating upstairs.
• Vaillant ecoTec Plus Gas boiler- serviced January 2022 and everything fine.
• Main unvented 300L cylinder. Cylinder stat set at 60C. Motorised valve seems to be working fine. Expansion tank checked Jan 2022 and repressurised – was well down before that.
• There is a secondary return pump which seems to be working fine and is timed to run in AM when CH working and when there is demand for showers.
• Mains pressure is excellent.
• Flow out of the taps is strong – H and C.