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- 30 Sep 2004
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Advice for hot water cylinder connection with a pump
We are having a complete new hot water system installed upstairs with loft tanks and a large capacity indirectly heated cylinder. Because the bath is quite large we are going to supply it with pumped hot and cold water, which will also feed to a separate shower. This means in effect all the hot water is pumped.
The plumbers connected the pump to the cylinder on Friday via a side tapping about 1/4 of the way down from the top. The boiler has not yet been commissioned and so at the moment the cylinder is heated via a top mounted immersion heater.
This morning we tried to have a bath in the existing normal bath, but the hot water ran out very quickly. This is obviously because the draw off point is only just below the immersion heater. The plumber has advised that when the boiler is working, the whole cylinder will be hot and so it won’t be a problem.
However, I am concerned that we are going to lose out on the hot water at the top of the cylinder. In effect because our draw off point is 3/4 of the way up, we can’t access 25% of the hot water.
The plumber says this is not a problem because the boiler coils will cause the hot at the top to be circulated round. I am a bit sceptical – I think that as the hot is drawn off, cold will come in at the bottom until it reaches the draw off point. At that moment, the hot will have run out, yet there is still plenty left above it. The cold will start to circulate and mix with the hot at the top, but that just means it will take less time for the cylinder to reheat, but that in terms of how much hot you can use before it runs out and you have to wait, we are losing out.
Is my understanding correct and would it be better in this scenario to take the draw off from the top ?
The pump is a Stuart Turner Monsoon 3 bar.
We are having a complete new hot water system installed upstairs with loft tanks and a large capacity indirectly heated cylinder. Because the bath is quite large we are going to supply it with pumped hot and cold water, which will also feed to a separate shower. This means in effect all the hot water is pumped.
The plumbers connected the pump to the cylinder on Friday via a side tapping about 1/4 of the way down from the top. The boiler has not yet been commissioned and so at the moment the cylinder is heated via a top mounted immersion heater.
This morning we tried to have a bath in the existing normal bath, but the hot water ran out very quickly. This is obviously because the draw off point is only just below the immersion heater. The plumber has advised that when the boiler is working, the whole cylinder will be hot and so it won’t be a problem.
However, I am concerned that we are going to lose out on the hot water at the top of the cylinder. In effect because our draw off point is 3/4 of the way up, we can’t access 25% of the hot water.
The plumber says this is not a problem because the boiler coils will cause the hot at the top to be circulated round. I am a bit sceptical – I think that as the hot is drawn off, cold will come in at the bottom until it reaches the draw off point. At that moment, the hot will have run out, yet there is still plenty left above it. The cold will start to circulate and mix with the hot at the top, but that just means it will take less time for the cylinder to reheat, but that in terms of how much hot you can use before it runs out and you have to wait, we are losing out.
Is my understanding correct and would it be better in this scenario to take the draw off from the top ?
The pump is a Stuart Turner Monsoon 3 bar.