Rainhead replacement

[morqthana]

I need to put a new rainhead on my shower (an Aqualisa Midas).

Is the thread on the end of the pipe going to be a standard one, which any head will fit? If not, what should I measure to find out what it is?

Also, would appreciate suggestions for makes to look at - one must have is no "chrome plated" plastic. I don't mind it having a plastic part, as long as it's 'honest', but if it looks like polished stainless steel I want it to be polished stainless steel.

Lastly, it runs off a combi, so I guess I don't need a head meant for "high pressure", but does it mean I shouldn't get one, or would it not matter?

 

[cross thread]

Most area standard 1/2 inch bsp thread.majority are plastic.

 

[CountryFan]

Lastly, it runs off a combi, so I guess I don't need a head meant for "high pressure", but does it mean I shouldn't get one, or would it not matter?

It’s usually stipulated as to the types of systems thy can be fitted to, most notably are low pressure and electric showers.

 

[Madrab]

As suggested, it all depends on the type you get. The flat plate type heads, which are usually the ones that are all steel, would normally require a high flow mains pressure shower and supply given the flat design and narrow waterways in the head to maintain a decent flow. With an Aqualisa Midas and a combi then flow and pressure shouldn't be an issue as they need =>1bar.

The thicker type heads are more universal and can be used on lower pressure/flow systems but more of them do tend to be plastic.

So it all really comes down to what type you want. Just get a direct replacement from Aqualisa?

 

[Justin Passing]

Pressure and flow are different, obviously, so quoting one tells you nothing about the other.
A combi will give you more flow than the ~4l/min you get from an electric shower and the pressure from both can be deemed high, but a combi's output on both measures will be totally inadequate for a big high flow rain head. A 4.5 bar twin pump fills anything at 40l/min.
Your mains could be as low as say 1 bar (or less upstairs) and your combi could provide say 10l/min, depending on the combi, the time of day and the time of year.
You need the specs for the head - good luck getting those.

"Low pressure" just means water will come out down to something like 0.2 bar (2 metres head) or whatever they quote.
The pressure AT the shower head is what they mean, not something most plumbers would think to measure.