I often have customers who send me pictures of the hot water cylinders in their homes and they ask for advice on how to do what what they want. to do. I am keen to advise on the best solutions and I seek to learn from customers with better ideas so that I can share the best ideas with future customers.

The Question
Dear Alan
I’m interested in purchasing your energy storage device – pictures of my HW cylinder attached.  I currently have a solar diverter to the HW cylinder immersion heater, but am getting limited energy storage capability.  I appreciate I will have to remove the surrey flange for the existing shower pump – I have tested a SP2B for the hot water, but I am still lacking pressure on the cold (header tank fed) so will have to purchase an additional manual pump as well.
Colin

Surrey Flange Replacement
A standard Surrey flange is generally designed to fit into a 1-inch (1″) female iron thread on top of a hot water cylinder, not directly onto 22mm pipework threads. While it accommodates 22mm pipework, it usually requires a 1-inch connection, meaning you may need to use a 1-inch to 22mm reducer.

To replace a Surrey flange and accommodate the energy device you will need a fitting which screws into the hot water cylinder to allow you to connect a short length of 22mm copper pipe which connects into the Energy Storage Device. To avoid unecessary heat loss its better to keep the Energy Saving Device close to the tank.

Gravity Hot & Cold (the need for a vent pipe)
To provide a perfect shower, a pump on the hot and a pump on the cold is needed.
You need to order the SP22S
You will note that the Energy Saving Device has a spare 15mm outlet which is normally capped off. This can be used to run a replacement vent pipe if you need to use the solution suggested below:-

The thinking behind the solution illustrated above is:-

The Energy Saving Device is close to the top of the hot water cylinder thus minimising heat loss.
Replacing the 22mm vent pipe by taking a 15mm pipe from the spare 15mm outlet on the Energy Saving Device allows one of the two ShowerPowerBoosters to be fitted horizontally. The new 15mm vent pipe can be plastic PEX pipe which is easier to fit.
Capping the original 22mm vent pipe with an air valve intercepts any air that bypasses the new 15mm vent pipe.