Ok so to recap
i need to have installed a full heating system into our house of which ive never done other than basic copper and pex pipework fittings ect. I have to work with a plumber who i cannot communicate with easily due to language barriers and i have limited resources which forces me to do as much of the work myself and to purchase as much fittings and materials as i can which saves me a fortune up to 1/3 of the total build price and yes i will be taking all responsibility for any malfunctioning part in the system.
All gas connections and fittings to boiler and any other plumbing that is beyond my abilities im happy to pay my plumber who i even organized to do the main connection from the gas tank to the house which would usually be done by the gas tank suppliers own fitters to try and get my plumber more work.
the build itself should be reasonably simple with DHW to 2 bathrooms ( no kitchens ) we have 8 rooms 2 bathrooms and 2 hallways that need to be heated all with Rads which i have been collecting for the last year from various locations and so half i purchased new and the others are second handers that i got either cheap or free. if the rads are undersized or in some way malfunctioning than ill replace as needed and as finances permits.
im be chasing in all walls and laying all internal circuits through out the house working off some initial planning i did with a different plumber i had first contacted but was not gas certified but only installed oil burners so he referd me to the plumber i currently am working with. So apart of my planning process is to gather as much understanding of the build with the help of this forum so than i can better work with my plumber as to what i can and cannot do. And to reiterate due to finance limitations im having to take the risks associated with sourcing my own parts and requiring a plumbers services as skilled laborer not a retailer.
So the build can be split up into 2 parts the internal house circuits made up of 2 zones the DHW to 2 bathrooms that are directly above each other and installation of radiators in rooms. The other part is the installation and connection of the gas burner and the pipework and fittings of pumps, valves, Pressure relief valves, low loss header if needed ect ect.
In regards to these 2 projects im rather competent to do the chasing and fitting of all internal pipe work and rad connections. Although id admit confirmation with the zone layouts and loads would be appreciated if i could confirm that with folks here before showing my plumber. Again due to the language barrier id like to have some forsight on possible issues that i dont see before having to waste my plumbers time.
As to the boiler connection id like to do as much as the layout as i can so that all my plumber would need to do is connect all connections to the boiler. problem is with this is that id need Knowledge help with the design layout And all parts required to complete the job. Which brings me back to the communication problem i have with my plumber and why if like to be as infoed and pre planned as i can be before i go over this with him. than i can better understand what i can realistically do myself and what i should leave for him.
i hope this helps in understanding my situation. And any any all help in furthering my understanding would be and is greatly appreciated. Even if i end up doing less work myself im happy to pay my plumber for his time. where i really save the money is in the parts and fittings so being informed about system design and possible options is really where this forum can save me and bring me in budget. Also i understand many tradies spend a lot of energy and time to learn their craft and it can be a tricky thing working with a plumber and asking for advice that is in the best interest of the client (DIYer) over a bigger payout for the tradie. Hence why forums like this exist and is a great recourse to Those who wanna give it a crack themselves.