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The vent is there to vent the drain to atmosphere, you would need to check with BC to see if you can do what you are asking, Air admittance valves only let air in, the vent allows gases to escape as well, why do you need to shorten it

It's obviously a wind up post, the OP came on here asking how much the gas test should cost, he then says his plumber knows how to test, he then says his plumbers mate who is Gas safe verified the test, well for his mate to verify the test, means he has to carry out the test, how else can he...

People are incorrect or misinformeed who state oversized radiators, the radiators are not oversized, they are sized correctly to give the required heat output for the room at a flow temperature 50°C doing this gives the customer a more efficient heating system and is more suited to condensing...

The simple solution to the OP's question is, Don't ask on here if the price seems ok, no one can answer that, we cannot see the job so it is impossible to answer a question on whether the price is fair or not, get a minimum of three quotes and then decide for yourself

adjust the locksheild valve to balance the system, most modern TRV valves can be fitted on the flow or return as they are bi-directional, so it does not matter if your TRV is on the flow or return, but it will ALWAYS be the locksheild valve that is adjusted in the balancing of the system, this...

Sorry if I am missing something, but from your picture it appears the installer has put the spirovent filter on the flow to the radiators, it should be on the return to the boiler to protect the boiler and pump, are you sure its not pumping the wrong way

Polypropylene is only availiable as push fit, solvent waste is not suitable for high temperature.

A leak would be reflected in the system pressure, when you took the pressure reading was the system hot or cold, the Atag Boilers should be pressurised to 1.5bar cold, I think changing the pump is your best bet and £190.00 is not a bad price, get them to check the filter in the return pipe of...

You only require a trap if you are entering a soil pipe, if you are discharging over a trapped gulley you do not need a trap as the boiler has its own trap. As you say Polypropylene pipe and fittings which is what you need for high temperatures are availiable from Screwfix, wickes etc, but...

Atag are excellent boilers, nothing in them that is any more complicated than any other boiler, installers who won't service them just don't know them, nothing to do with them been over complicated, I think you have been unlucky, I have fitted loads of Atag boilers and never had any major...

The boiler would cut out at 0.7bar, there is no law that says you need a tundish at the boiler, with the Atag you have to remember that you have the condense coming out of the same pipe.

Yes other boilers have copper for the safety discharge only, this is combined safety discharge and condense, because of the condense plastic pipe has to be used, consense will corrode copper

Do as was done before, simply use 32mm plastic right up to the discharge on the boiler, no need for tundish, just needs an air gap which will be created by the 32,, pipe

Yes 60kW will definately have a low loss header as the internal pump will only have the capacity to pump around the heat exchanger, you will also have an external pump, it will be the internal pump fault that will be causing the bL85

bL 85 means that the control has NOT detected a water flow, so as Atag said it will either be pump fault, filter blockage there is a filter built into the return pipe inside the boiler, I would think this is the best place to start, but I would get an engineer to look at this, pressure sensor? I...

Do you not read the OP, they quite clearly stated "1x 24 kw Boiler (not a combi- I believe a Worcester Bosch Greenstar 24i was recommended") The clue I feel is the "Not a Combi"

"Gorilla", typical of these forums, people have to resort to insults, sad. You stated your opinion as a DIYer, I stated my opinion as a proffessional, you don't like my opinion so you resort to calling names, why is that? Compression fittings are designed so when tightned the face of the...

Well try and ensure you buy good quality fittings instead of cheap crap, false economy in my opinion

So you think that someone who believes things should be done right is annoying, do you cut corners then?

Grow up