Ive moved into a new house which is old, ive chanced it to see if an aqualisa shower will work that was given to me by a family member, who then bought a new one, its all fully setup but only cold water comes out, the hot doesent seem to work. I assume its the expansion tank or whatever its called is the problem, but could I be mssing something else? When pressing the power button cold water comes out for about 20 seconds, then stops. Hot water not working. So I think its most probably the expansion tank or something ive missed?(The expansion tank has an outlet pipe, not ssure if this effects anything?) Thats where im at, Ive tried to list as much info as possible any help would be greatly apprecaited. Ive also included pics below.
Aqualisa showers and Expansion tank
- Thread starter 79diz
- Start date
What do you mean by expansion tank? I can see a hot water cylinder in your pic.
Your shower appears to be electronically controlled. It doesn't look big enough to have a pump in it. I am not familiar with the model. It looks like it is the electronic thermostatic mixer.
One common mistake, is when the hot and the cold water are at different pressures. I can see your hot water cylinder is a low-pressure copper one. But what pressure is your cold water? Is it supplied from the loft cold water tank?
Put your thumb over the spout of a hot tap and turn it on. You can hold back the flow easily. That is low pressure. Now try with a cold tap. Can you do the same?
Your shower appears to be electronically controlled. It doesn't look big enough to have a pump in it. I am not familiar with the model. It looks like it is the electronic thermostatic mixer.
One common mistake, is when the hot and the cold water are at different pressures. I can see your hot water cylinder is a low-pressure copper one. But what pressure is your cold water? Is it supplied from the loft cold water tank?
Put your thumb over the spout of a hot tap and turn it on. You can hold back the flow easily. That is low pressure. Now try with a cold tap. Can you do the same?
The clue is on the inlet specs - min inlet pressure is 1Bar. That processor is for what is called a high pressure system and is non pumped. You have an open vented gravity HW system and would need the pumped version. Ask whoever gave you the box, they should confirm that they have a combi or an unvented cylinder.
This is what the pumped processor looks like - separate pump housing at the top
This is what the pumped processor looks like - separate pump housing at the top
As Madrab says, you have the wrong processor. There is a company that does repairs and reconditions these processors. I know they do an exchange for people changing from a vented to a pressurised system. They will probably do the same for you and exchange yours for a pumped version. Will be a lot cheaper than buying new. I've used them a few times and had excellent service.
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Looking closer at your pictures, it appears you have a combination cylinder with a small cold water store on top of the hot cylinder. If this is the case, a pumped shower is not an option as you don't have sufficient cold water storage. An electric shower using mains water is really your best option until you can properly update the system.