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That's irrelevant to my question....

I'm dealing with DNO on a daily basics due to my work, it is hard, it is very hard, sometimes impassible to get a suitable solution. 16mm swa 2 core cable can handle about 130A. I advised my friend to put 9kw boiler to the outbuilding which will be sufficient enough but he is stubborn and...

I know that all calculations say no but this is the situation and I'm looking for a solution. There is the house that has and electric 15kw heating boiler plus the other household equipment, like cooker, kettle etc. All run from single phase 16mm^2 main cable and protected by 80A fuse in cut...

Yep. Its a part if electric boiler. Outlet has 2 pipes. Second is controlled by 3 bar valve that goes unobstructed by any valves to top of the loft water tank.

Never heard about the tanks failing so thanks for the info. Will get them check, although in my case it would not happen with electric boiler as I mentioned before it has a safety switch that will turn it off and boiler just cool itself down as kettle would do. If any excessive pressure will...

Well thought system, My system works, might not be the best and I might update it over the time but so far so go. To answer your questions. 1) What ever happens to my motorisdes valves all hot water will be pumped to the top of expansion tank which is in the loft. If by any chance to much water...

Yes. I did that for the electric boiler which has separate outlet with a 3 bar safety valve that is piped unobstructed back to the top of gravity tank. Haven't done it yet for a oil boiler which at the moment won't be shut off for the safety and electric boiler will be heating it unnecessarily...

Plumbing. I fitted 5 ball valves that you can shut boilers inlet and outlet. I piped oil boiler inlet and outlet together and fitted 5th ball valve on the linked pipe which in normal operation is closed and open only in the winter when electric boiler is in use so when temperature lowers below...

Yes. Thank you. on that principle I have solved the puzzle. All is wired up and working fine. Before I will tell you how I let you try to figure it out. it is very easy if you think outside of the box. the only added parts I'm using are 2 way light switch to switch between boilers and second...

Water will flow if piped in after motorized valve

Thanks. Will have a look into that.

Can't answer those questions as have no idea. Was hoping it will be much easier. If i can't figure it out, will just re pipe the outlet of the boiler after the existing circulation pump and add another one for electric boiler. Will use electric boiler for heating radiators only and oil for...

I all fairness my plan was to take a wires from hive and connect them to 2 way light switch. Then one switch can operate oil boiler and other electric boiler. No issues with oil as it is already wired but issue with electric is that I still need a signal to put a pump and motorized valves on.

Ok. Thanks for some info. Both boilers are plumbed in the way so they can be shut off by valves so not being heated unnecessarily. Oil boiler can run in the loop in the winter if temp goes below 5C as being fitted outside the house. Electric boiler is connected to 63a rcd by 10mm^2 cable. I...

I did. Posted a picture of it. tells me nothing If you don't like helping people for free I will pay you. Just tell me how to wire it.

Don't understand whats the point of your childish coments? If you know how to wire it, you could use same effort and just tell me, unless you just prefer not to

Yep. house is off grid and we do produce way to much that we can use or store so needs to go somewhere. We do not produce enough to have electric heating only so we have oil. It is all plumbed and connected to electricity. Just need to know how to wire it to current system so I can easily swap...

Ok. You said what you need to. If not willing to help just stay quiet. I hope someone will be able to help.

Finlay managed to plumb both boilers together. Now need to wire them but need to ask someone for help. I like the idea of a switch between 2 boilers as only one will be used at the time. There is only one circulation pump and current oil boiler is wires to the junction box. Pictures below...

Oil boiler that I'm using is Grant vortex eco external system 21-26 so as far as I'm aware there is no internal pump. I have 2 motorized valves changing between CH and HW and circulation pump for CH. I can buy an electric boiler without pump so that should solve any potential problems if that...