Hi
I did ask a similar question over a year ago when my house refurb/extension was meant to happen. This was delayed for loads of reasons and actually only started last week!
So here we go again but this time I've tried to gather as much solid information as possible. At present I have
1) A 22mm inlet pipe
2) A thermal store in the loft.
3) A WB system boiler.
To be honest the system has never really performed, the biggest issue being trying to run a shower and any other outlet at the same time ie the flow becomes poor.
Over the years I think the TS has become sludged on the inside coil as now in winter I'll only get hot water in the shower for about 5 minutes and then it starts to cool.
I'm having some major works done on the house including quite a large extension. When all the work is done the property will have
1) About 3200 sq/ft over three floors.
2) An electric shower(back up) on the ground floor, three shower rooms on the first floor and two shower rooms on the third floor.
3) About 30 rads.
My measurements are
1) I have a prv on my system set to 3 bar. If I turn this up I can get about 5.5bar.
2) Dynamic pressure and flow; I added a pressure gauge (as adviced) onto the prv and got the following numbers
a) PRV set to 3 bar, gauge reads 2.6 bar and dynamic pressure (garden tap on full) dips to 1.8bar. Flow rate is 19l/min.
b) PRV set to 4 bar, gauge reads 3.6 bar and dynamic pressure is 2.8 bar and flow is 24l/min
c) PRV set to 5bar, gauge reads 4.6 bar and dynamic pressure is 3.6 bar with flow rate of 26l/min.
At 6 bar the flow rate is 28l/min.
My requirements
1) To be able to regularly use two showers at the same time, both providing an adequate volume of hot water. There should be an additional bit of slack in the system ie if somebody fills a sink or wants to fill the kettle then the showers should still perform.
2) Two more concurrent showers should be able to function about 15-20
minutes later.
My first question is should I upgrade the inlet pipe from 22mm to 35mm? A new drive was laid a few years ago so I would have to call in a mole company at some cost.
Secondly, how would you design the new system to meet my demands? I know there is more than one way to skin a cat but ideas would be welcome.
My own feeling is this;
1) A second boiler added.
2) A 300l unvented cylinder.
3) Two 500 litre accumulators.
Thanks in advance
I did ask a similar question over a year ago when my house refurb/extension was meant to happen. This was delayed for loads of reasons and actually only started last week!
So here we go again but this time I've tried to gather as much solid information as possible. At present I have
1) A 22mm inlet pipe
2) A thermal store in the loft.
3) A WB system boiler.
To be honest the system has never really performed, the biggest issue being trying to run a shower and any other outlet at the same time ie the flow becomes poor.
Over the years I think the TS has become sludged on the inside coil as now in winter I'll only get hot water in the shower for about 5 minutes and then it starts to cool.
I'm having some major works done on the house including quite a large extension. When all the work is done the property will have
1) About 3200 sq/ft over three floors.
2) An electric shower(back up) on the ground floor, three shower rooms on the first floor and two shower rooms on the third floor.
3) About 30 rads.
My measurements are
1) I have a prv on my system set to 3 bar. If I turn this up I can get about 5.5bar.
2) Dynamic pressure and flow; I added a pressure gauge (as adviced) onto the prv and got the following numbers
a) PRV set to 3 bar, gauge reads 2.6 bar and dynamic pressure (garden tap on full) dips to 1.8bar. Flow rate is 19l/min.
b) PRV set to 4 bar, gauge reads 3.6 bar and dynamic pressure is 2.8 bar and flow is 24l/min
c) PRV set to 5bar, gauge reads 4.6 bar and dynamic pressure is 3.6 bar with flow rate of 26l/min.
At 6 bar the flow rate is 28l/min.
My requirements
1) To be able to regularly use two showers at the same time, both providing an adequate volume of hot water. There should be an additional bit of slack in the system ie if somebody fills a sink or wants to fill the kettle then the showers should still perform.
2) Two more concurrent showers should be able to function about 15-20
minutes later.
My first question is should I upgrade the inlet pipe from 22mm to 35mm? A new drive was laid a few years ago so I would have to call in a mole company at some cost.
Secondly, how would you design the new system to meet my demands? I know there is more than one way to skin a cat but ideas would be welcome.
My own feeling is this;
1) A second boiler added.
2) A 300l unvented cylinder.
3) Two 500 litre accumulators.
Thanks in advance