Connect 3/4" BSP male cylinder flange to 3/4" BSP male cylinder HW outlet

[chris911sc]

My latest plan is to do as follow....

 

[JimCrow]

Use the plugged temperature and pressure relief tapping for your shower.

 

[Gasguru]

Agree...but what are all those take-offs?
Mystery system...got solar?
Whatever you do don't take the vent vertically off the cyl connection...you'll waste heat.

 

[chris911sc]

Mystery system...got solar?

The plumber & contractor were pushing for us to install solar all along during the renovation work (5 months, back of the house was gutted).
Plumber went ahead with this UltraSteel Solar Indirect AUSI300XS while my wife & myself were still debating to go solar or not. Plumber was well aware of that, but probably jump the gun.
In the end, we didn't as it did not make any economic sense on paper

 

[JimCrow]

Agree...but what are all those take-offs?
Mystery system...got solar?
Whatever you do don't take the vent vertically off the cyl connection...you'll waste heat.

Four tappings are stat pockets and the two at the botton with the red handled ball valves is the solar coil.

 

[chris911sc]

Use the plugged temperature and pressure relief tapping for your shower.

Thanks for your inputs so far.

Do you suggest using the plugged temperature and pressure relief tapping because it is easier or because it is better? If using the temp & pressure relied outlet, is an inverted loop required ?

The pump inlets/outlets are 3/4", so are the new pipes to the shower, though reduced to 1/2" to join into the shower mixer tap. Any issue tapping from 1/2" outlet of the HW cylinder?
I had in mind to use as much 3/4" as possible, though may not be justified since the pump is dedicated to one shower only.

 

[JimCrow]

Use the 22mm secondary return tapping then, the temperature and pressure relief tapping is higher up the cylinder (more hot water use), yes, you will need an anti gravity loop if the pump is above the hot supply from your cylinder.

 

[ianmcd]

You have an expensive, unvented HW cylinder connected as an open vented cylinder and you want to connect a pump to it ?????? if you have decent cold water supply get the cylinder fitted properly, that is just a mess, and you wont need a noisy unreliable pump