wytco0
20-10-2012, 07:51 PM
Um I am trying to work out the best options for DHW for my LT system consisiting fo the following.
•Heat pump outdoor unit is a Daikin ERHQ016BAV3
•Heat pump indoor unit is a Daikin EKHBH016BB6V3
•Tank is a Daikin EKHW5U300B3V3
I have been watching it for about 7 months now and with DHW on all the time it heats water every hour or 2 for a few minutes even when none has been used, as soon as there is demand it heats as well (as expected).
I am now going to put a timer on for DHW but I can't decide the best time to do it. We have a 5 bed house which is highly insulated and normally only has 2 people in it. We have showers between about 0600-0900 most days and then use almost no hot water for the rest of the day. We also have 2 solar panels which may heat during the day.
My initial thought was to set the DHW timer to run from about 0400-0800 which should mean hot water for when we shower and a good change that it will be reheated after the shower. However this will also probably be the coldest time of the day outside which will mean the ASHP will be working hard and be less efficient. So next thought was run it for about 4 hours from approx 1600-2000 and then again for 1 hour from 0500-0600. This would proobably be more efficient in terms of the pump but I am not sure how much heat will be lost dirung the night from the tank and if 1 hour will be enough for reheat.
Obviously I alslo want to gain from any solar heat I can pickup during the day.
So grateful for any thoughts and suggestions.
•Heat pump outdoor unit is a Daikin ERHQ016BAV3
•Heat pump indoor unit is a Daikin EKHBH016BB6V3
•Tank is a Daikin EKHW5U300B3V3
I have been watching it for about 7 months now and with DHW on all the time it heats water every hour or 2 for a few minutes even when none has been used, as soon as there is demand it heats as well (as expected).
I am now going to put a timer on for DHW but I can't decide the best time to do it. We have a 5 bed house which is highly insulated and normally only has 2 people in it. We have showers between about 0600-0900 most days and then use almost no hot water for the rest of the day. We also have 2 solar panels which may heat during the day.
My initial thought was to set the DHW timer to run from about 0400-0800 which should mean hot water for when we shower and a good change that it will be reheated after the shower. However this will also probably be the coldest time of the day outside which will mean the ASHP will be working hard and be less efficient. So next thought was run it for about 4 hours from approx 1600-2000 and then again for 1 hour from 0500-0600. This would proobably be more efficient in terms of the pump but I am not sure how much heat will be lost dirung the night from the tank and if 1 hour will be enough for reheat.
Obviously I alslo want to gain from any solar heat I can pickup during the day.
So grateful for any thoughts and suggestions.