Hi,
Having spoken with 3 different plumbers and got 3 totally different answers I have decided I had better try to get some impartial advice before proceeding down the wrong path!
I have just moved into a nice 1970's bungalow. Having spent all summer insulating the place I now have a nice insulated box and the plan is to remove the baxi gas back boiler heating system (it runs off 47kg bottles at an alarming rate) and fit an ASHP system coupled to a wet system, providing domestic hot water and heating.
Obviously this system runs at low temperatures so all the emitters have to be replaced with larger more efficent units, the plan is to use the Myson double panel Type 22g emitters. I have done all the calcs for each room and have specified the emitters. My troubles start when trying to get each plumber to spec the pipe sizes they would run the system in, flow rate is more critical as I understand due to the low temperatures involved.
The most sensible system seemed to be running a 22mm pipe to a central manifold before running seperate legs to each emitter at 15mm. Each emitter would have a thermostatic valve fitted apart from the hall which would form the bypass circuit. This was in speedfit plastic. Longest pipe run would be 34m (combined flow and return including run between manifold and hydro box)
What do people rekon? From what I have read the pipes are capable of carrying the heat capacity however, speedfit internal bore is dramatically restircted at each joint surely the flow therefore would be insufficent?
Thanks for reading this far!
Mark.
Having spoken with 3 different plumbers and got 3 totally different answers I have decided I had better try to get some impartial advice before proceeding down the wrong path!
I have just moved into a nice 1970's bungalow. Having spent all summer insulating the place I now have a nice insulated box and the plan is to remove the baxi gas back boiler heating system (it runs off 47kg bottles at an alarming rate) and fit an ASHP system coupled to a wet system, providing domestic hot water and heating.
Obviously this system runs at low temperatures so all the emitters have to be replaced with larger more efficent units, the plan is to use the Myson double panel Type 22g emitters. I have done all the calcs for each room and have specified the emitters. My troubles start when trying to get each plumber to spec the pipe sizes they would run the system in, flow rate is more critical as I understand due to the low temperatures involved.
The most sensible system seemed to be running a 22mm pipe to a central manifold before running seperate legs to each emitter at 15mm. Each emitter would have a thermostatic valve fitted apart from the hall which would form the bypass circuit. This was in speedfit plastic. Longest pipe run would be 34m (combined flow and return including run between manifold and hydro box)
What do people rekon? From what I have read the pipes are capable of carrying the heat capacity however, speedfit internal bore is dramatically restircted at each joint surely the flow therefore would be insufficent?
Thanks for reading this far!
Mark.