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It will work fine from a combi, minimum pressure 1 bar it says. Also says for use with combi boiler ;) i fit these all the time, great pressure! It wouldnt do any harm fitting a check valve incase the shower becomes faulty and passes.

Hot and cold pumped , shower should be equal pressure. By what your saying is the hot is stonger pressure which it shouldnt. Depends where the poor pressure is. Tho theres filter on the inlet connection on the shower and also the connections on the pump

Very easy to change. Pick one up from a supplier and ask him. You dont need to replace the whole thing. But again ask him to show you as its hard to explain. Turn mains water off and open hot and cold tap and drain roughly half a tank as this makes it easyier to change

Is it a twin pump? Both hot and cold should be the same. There is filters fited at the connection so quiet possible dirt has blocked a filter.

Hi, i would place it on the outlet off your second cylinder, as your first cylinder is basically acting as a storage tank only this is preheated first before it reaches the second cylinder. Its a strange set up and why the didnt used unvented pressurised cylinders in the first place. It depends...

When you bought the pump was there not instructions on where to fit?? Certain manufactures request you to fit in a certain position to cover warranty and to stop air etc it should never pump into a cylinder so that rules out (a) it should be position on the outlet of cylinder at the base of it...

Your boiler can only produce a certain litres per min, roughly 11 per minute, as u see from your boiler hot outlet it 15mm as this is suitable. Whatever way you pipe it if someone else opens a hot tap while your having a shower the water flow rate will drop. Presure is reduced when it enters the...

Sorry but thats what i meant when saying "stuck" sometimes they seize. Didnt want to go into much detail. The diaphragm isnt doing ist job are the flow switch isnt working. Either way he needs someone in to fix it. All you had to do was correct me ;)

???? What??? Like i said the flow switch isnt operating! So either flow switch r a £20 repair kit, not expensive at all. People like you that offer no help except try and have ago need a good shake

Diverter valve isnt operating the flow switch. Its stuck r needs replaced. Part it self isnt too expensive

You should have a twin channel time clock. Hot water and heating. You can turn either one on at a time are both. The boiler fires the heats what you have switch on. In the winter months you would turn on both and once the cyliner stat reachs temperture it shuts of. Its the same with your room...

Theres a chance it could be but there are tests a engineer can do to prove that the board is geting a signal etc boards are really expensive. Does this gas valve have its own board on it?

Ooo sorry lol your pumps ****ed and new expansion vessel needed,take the cap if front of pump and if its not spinning when turned on its gone. Pretty easy to change tho still expensive as they are a rated pumps these days

Sounds like a fault in the combustion chamber, and could be a few things,ul need a gas safe engineer in to repair it

The fault is staring at you! You have two problems by the sounds of it. Get a gas safe engineer in to have a look at it. Not allow to give advice on boilers. Parts you need are pretty expensive and not a diy job

At the back of the neck theres a alan key r small flat head screw, try tighting this! Otherwise you will have loosen it and take the neck off and replace the two washers

It could be a number of things but your going to need a boiler engineer to look at it, does sound like a circulating problem are could be diverter valve stuck in hot water position are faulty ntc! All of which can be tested to see if there working before being replaced