Intergas claims its hex design is so efficient but to me either heating or DHW is being heated unnecessarily every time.
Say you want hot water, as it's being heated in the hex, the water for heating is sitting in the pipe nearby within the hex and is being heated as well, instead of all the heat being used for hot water. The opposite happens when you want heating. DHW is being heated but not used.
With the standard design using a secondary hex, it's always the primary water being heated and moved around where needed.
I've also noticed that DHW in an Intergas boiler gets scalding hot if you open the tap shortly after having closed it. The hot water has been sitting in the primary hex instead of flowing through it quickly. Again, not so much the case with the standard design. DHW does get hot but not as much, probably because the primary water has stopped circulating.
What do you guys think? I went to their training session once and asked this but the trainer was quite dismissive, claiming there's an air gap around the pipe (pipe in pipe design) within the hex that prevents heat loss. I didn't bother pointing out it would prevent heat gain as well...
Say you want hot water, as it's being heated in the hex, the water for heating is sitting in the pipe nearby within the hex and is being heated as well, instead of all the heat being used for hot water. The opposite happens when you want heating. DHW is being heated but not used.
With the standard design using a secondary hex, it's always the primary water being heated and moved around where needed.
I've also noticed that DHW in an Intergas boiler gets scalding hot if you open the tap shortly after having closed it. The hot water has been sitting in the primary hex instead of flowing through it quickly. Again, not so much the case with the standard design. DHW does get hot but not as much, probably because the primary water has stopped circulating.
What do you guys think? I went to their training session once and asked this but the trainer was quite dismissive, claiming there's an air gap around the pipe (pipe in pipe design) within the hex that prevents heat loss. I didn't bother pointing out it would prevent heat gain as well...
