2 hot water cylinders on a solid fuel primary circuit

[tomstephens]

I'm wanting to run 2 hot water cylinders from my solid fuel boiler , instead of buying a very expensive large one . I already have the copper cylinders. I would like to give one priority over the other, and rely on gravity only , if possible . Is it ok to run a 28mm hot feed up , which is teed into the cylinders , which will be side by side . No. 2 cylinder primary circuit will be controlled by a motorised valve , thermostatically set to open when the return pipe on No.1 tank reaches a certain temperature . I know it says not to have valves on a primary solid fuel circuit , but as the main tank is always open , maybe this is ok ? . The hot feed pipe would carry on up and vent into the feed and expansion tank .
The cold secondary feed would enter No 2 tank , the hot secondary outlet from No 2 would go into the cold inlet of No 1 , and then the hot water outlet would go to the taps .
Maybe I have got some of my terms wrong , as I'm a DIYer , if so , sorry for the confusion .

 

[Pipes Plumbing]

Hi Tom,

You need to get a HETAS Wet system engineer in to look at this. You really do not want to be DIYing Solid fuel installations; not only can they be extremely dangerous if done wrong, they can also be an absolute nightmare to live with if they aren't designed right upfront.

How is the installation going to be signed off by Building Control, as it is a controlled service? If it isnt signed off and a completion certificate issued, should the worst happenyou could be deemed liable for any damage or injuries caused.

A HETAS engineer will be able to self certify the work which could save you up to £500 in building control fees, as well as ensuring you have a safe, effective system.

Pop a post up in the looking for an engineer section and a local, reliable member may be ableto help you out

 

[lame plumber]

the words from Baldrick come to mind "bOOM, bOOM,|bOOM. You even state "I know it says not to have valves on a primary solid fuel circuit" but off you go asking anyhow

 

[Killy Bing]

get a hetas engineer, you're gonna end up scolding a little kid.....

you've admitted you're a diyer so you will be completely ignorant of the cause and effect of your suggestion.

don't do it.....

tom, if your kid went to a friends and left in an ambulance with scolding because her dad did a diy solid fuel system without knowing what, how or why he was doing it.

what would you think of him ?

please answer this and don't avoid it.
i would like to see how you can justify it

 

[SimonG]

All you need to know in post 2. But please answer kb's question!

 

[albatross]

You do not want to attempt this yourself.

Are the cylinders you have even suitable for gravity? Not all are.

Both cylinders would need vent pipes.

 

[Ermintrude]

Did you know that all it takes is one chain of carbon atoms to be on the left hand side of thalidomide molecule and it is pretty bad optician isomer to take when pregnant. Bit like your situation. Mix one tiny thing up and pop goes the weasel.

 

[WHPES]

There's only two ways to do an installation - the right way, and the wrong way.