New boiler on old system

The old boiler may have gravity DHW. Also it is best to fit a "Quick Recovery" cylinder, NOT a Part L. Insist on one. This will take all the boilers output and promote condensing. Also what make and model of boiler is he specifying?

Technically the old cylinder can stay, but it would be foolish to keep it. The TRVs have to be added.

Hi,

No, it's fully pumped, either Y plan or W plan.

That I can understand.

On what grounds, technical or regulatory?

Thanks, Martin.

Regulatory.

Utter Dribble

thanks you for the solid contribution.

Is that for a complete new installation, or even if you simply add a new rad to an existing system that currently uses a room stat

Malcolm

New and boiler change - it is how they interpret the regs.

He is half right, half wrong.

When replacing the boiler, you WILL need to update the controls if they're not up to current standards. You WILL NOT need to replace the cylinder, although if the old one is in bad condition, poorly insulated or has a tiny coil, then it might be a good idea anyway.

By controls, you will need:

1. Separate temperature control of sleeping and living areas. This is most cheaply and commonly done with TRVs.
2. In a large house, separate timing control of sleeping and living areas. This is usually done by subzoning with zone valves, although electronically controlled TRVs can also be used.
3. Fully independent control of hot water and central heating.
4. Thermostat on the hot water cylinder.
5. Fully pumped circulation in both the radiator circuit and the hot water circuit.
6. Boiler interlock. When there is no call for heat, the boiler burner must entirely switch off and must not keep the primary water hot. This is usually done using a room thermostat or a flow switch.

Christian.

Or alternatively, mend the old boiler. Much cheaper option.

Regards Capitol

In a new system it ios cheaper to zone.

electronically

Or two boilers on separate systems.

You can retain the room stat for that room, and obviously not fit TRVs in that room, while fitting them to all the other rads. And if fitting a new rad it would be crazy not to fit a TRV. However, fitting an extra rad will involve draining down, so it makes economic sense to fit TRVs to the other rooms (but not the one with the stat) at the same time and of course add inhibitor. TRVs should recover their cost quite quickly. But if you go down this route, use quality TRVs from a PM, etc. Shed ones tend to have a short life.

My 30 year old system satisfies all these requirements already. And always has done.

It hasn't been serviced for 18 years and he needs to take a mortgage to pay the gas bills.

Why fiddle with something that works perfectly?

But once again I'd ask what you'd service on a heating system, since you plainly don't haven't a clue. Since you can't find it on a website.

I don't need a mortgage for anything, pet. Unlike you who seem to just wreck your relations plumbing for a 'living', I make enough money to pay all my bills as and when they become due.

But then your clinic bills must be high, very high.

The senility is certainly taking hold.

The senility is certainly taking hold in big way.

..the Plowman man he calls me pet ..of inverted gender he must be set ..he gives us info we don't need to know ..down our throats he rams it so

..instictively you will spy ..in newsgroups with DIY ..attempting wisdom this fool will try

..the info's so poor tis clearly true ..so how does this garbage affect you?

..well take no heed of babble and drool ..as this one is a confirmed fool

..he marches around in CAT boots of yellow ..this strange brain damaged sort of fellow

..misadvice he has lots to say ..so don't give this yellow booted half-wit the time of day

Ask the nurse for more medication. The 'poetry' fetish has started again.

Or ask the nurse to write it for you. Or anyone, really. Can't be worse than your efforts.

Is this must be your sexual perversion nurse

On Thu, 29 Sep 2005 10:12:24 +0100, "Doctor Drivel" scrawled:

???

Still knocking back the sherry in the early hours I see.