Newark ministore DHW cylinder (Shell and Tube Heat Exchanger)

[Tide2]

Has anyone experience using or installing these with a gas combi boiler

[JohnMo]

2 hours ago, Tide2 said:

Has anyone experience using or installing these with a gas combi boiler

Why would you install with a gas combi? Tell us what you are trying to achieve?

[Nickfromwales]

1 hour ago, JohnMo said:

Why would you install with a gas combi? Tell us what you are trying to achieve?

Usually to get higher DHW flow rates, or possibly somewhere to bin off some excess solar PV.

[JohnMo]

28 minutes ago, Nickfromwales said:

Usually to get higher DHW flow rates, or possibly somewhere to bin off some excess solar PV.

Maybe simpler to do it upstream of the combi rather than after. Then small amounts of temp rise give massive uplift in flow rate.

 

Combi-SuperFlow-White-Paper-v1-2-4.pdfCanetis-SuperFlow-Product-Sheet-WE-050318.pdf

 

You can also do it way more cheaply than a mini store. As a mini store is based on heating medium in the cylinder and domestic water in the tubes.

 

So you really need to connect the combi to system boiler for the proposed to work.

[Nickfromwales]

21 hours ago, JohnMo said:

Maybe simpler to do it upstream of the combi rather than after. Then small amounts of temp rise give massive uplift in flow rate.

 

Combi-SuperFlow-White-Paper-v1-2-4.pdf 960.61 kB · 12 downloads Canetis-SuperFlow-Product-Sheet-WE-050318.pdf 322.43 kB · 5 downloads

 

You can also do it way more cheaply than a mini store. As a mini store is based on heating medium in the cylinder and domestic water in the tubes.

 

So you really need to connect the combi to system boiler for the proposed to work.

You’re still always constrained by the physical max flow rate of water, whatever temp, through a combi.

[JohnMo]

49 minutes ago, Nickfromwales said:

You’re still always constrained by the physical max flow rate of water, whatever temp, through a combi.

Could get 3 showers out of mine, you take the flow restrictor out, I never installed mine, because I always preheat with upstream preheat, can't do any better with UVC I now have. 

Edited 7 hours ago by JohnMo

[Nickfromwales]

5 hours ago, JohnMo said:

Could get 3 showers out of mine, you take the flow restrictor out, I never installed mine, because I always preheat with upstream preheat, can't do any better with UVC I now have. 

UVC doesn't give higher flow rates at the 50^o+ temps? Combi's can't usually be compared.

 

3 showers is very good, at what flow rates?