Hi all. I have bought a cheap boiler to run my hot tub as others have on the interweb and have a question that you amazing plumbers will probably know the answer to straight away.
I have the setup as pictured below and I am about to run some tests to get the best output all round.
I am looking for the best balance of flow vs efficiency vs speed to heat.
I originally booked the boiler up to test with the garden hose and power was quite good out of the boiler. Gas regulation was low and temperature setting half way to get 40 degree water.
I fitted the central heating pump and it seems a lot less power OUT of the boiler, and can't get 40 degrees anymore. It sits around 60 with gas regulator on its lowest and temperature dial (which just essentially slows the water flow through it) also to lowest. I thought the pump would have pushed more than it does.
I need faster flow OUT for another reason, and that's to push the freshly heated water around the hot tub and mix with the cold.
I am going to run a series of tests using the CH pump on all three speed settings. Once through the boiler and once bypassing it. And then do the same using 10mm return pipe in the hope that it will come out at a higher pressure to create my mixing effect. I will know the answer shorty to this, however I don't have any 22mm pipe and don't really want to buy a length just for a test, but if I replace the supply and return lines with 22mm, will it increase the flow or not?
it doesn't appear that the hosepipe or 15mm is restricting the flow INTO the boiler as the garden tap before pushed much more water through, so don't think that is restricting it.
any ideas or knowledge on the physics of this would greatly be appreciated.
Thank you in advance.
I have the setup as pictured below and I am about to run some tests to get the best output all round.
I am looking for the best balance of flow vs efficiency vs speed to heat.
I originally booked the boiler up to test with the garden hose and power was quite good out of the boiler. Gas regulation was low and temperature setting half way to get 40 degree water.
I fitted the central heating pump and it seems a lot less power OUT of the boiler, and can't get 40 degrees anymore. It sits around 60 with gas regulator on its lowest and temperature dial (which just essentially slows the water flow through it) also to lowest. I thought the pump would have pushed more than it does.
I need faster flow OUT for another reason, and that's to push the freshly heated water around the hot tub and mix with the cold.
I am going to run a series of tests using the CH pump on all three speed settings. Once through the boiler and once bypassing it. And then do the same using 10mm return pipe in the hope that it will come out at a higher pressure to create my mixing effect. I will know the answer shorty to this, however I don't have any 22mm pipe and don't really want to buy a length just for a test, but if I replace the supply and return lines with 22mm, will it increase the flow or not?
it doesn't appear that the hosepipe or 15mm is restricting the flow INTO the boiler as the garden tap before pushed much more water through, so don't think that is restricting it.
any ideas or knowledge on the physics of this would greatly be appreciated.
Thank you in advance.