Boiler Systems & Heating Questions

bigbru

Hi All

About to move into a 70's house, 4-bed semi, 70,000 BTU's. It currently has an old oil boiler in a concrete shed in the garden, plan to replace heating system with new natural gas boiler/pipes/rads/controls.
Any idea what i would pay:
1. for the whole job from a plumber in Dublin
2. paying a plumber for labour only, and I supply all parts
3. price of all parts sourced in Dublin vs. North or UK

Any recommendations for:
- brand of boiler (Worcester/Vokera/Potterton etc.)
- type of boiler - combi or heating only

And assuming I get a combi boiler, does it still heat a water tank via a coil when the rads are on, even though it heats water on demand? How does that work.

Any feedback appreciated.

bigbru

fyi, someone recommended a "Ferroli Domicompact F24 B Combi Boiler NG" as being a good one.

davidoco

bigbru wrote: »

new natural gas boiler/pipes/rads/controls. ..............

does it still heat a water tank via a coil when the rads are on, even though it heats water on demand? How does that work.

.

Before you do any work or spend money take note of the http://www.sei.ie/Grants/Pilot_Home_Energy_Saving_Scheme/

No hot water cylinder. You turn on the hot tap the gas boiler fires up and heats the water as it passes through. Sometimes leads to slight delay in receiving hot water at the tap.

bigbru

Would it not be prudent to keep a tank with an electric immersion heater in it, as a back up if the boiler or gas supply failed?
And if you remove the tank from the hot-press, is it no longer a hot-press... seeing there's nothing hot in it any more?

MicktheMan

bigbru wrote: »

Hi All

About to move into a 70's house, 4-bed semi, 70,000 BTU's. It currently has an old oil boiler in a concrete shed in the garden, plan to replace heating system with new natural gas boiler/pipes/rads/controls.
Any idea what i would pay:
1. for the whole job from a plumber in Dublin
2. paying a plumber for labour only, and I supply all parts
3. price of all parts sourced in Dublin vs. North or UK

Any recommendations for:
- brand of boiler (Worcester/Vokera/Potterton etc.)
- type of boiler - combi or heating only

And assuming I get a combi boiler, does it still heat a water tank via a coil when the rads are on, even though it heats water on demand? How does that work.

Any feedback appreciated.

A 1970's sd house ...
I would first make sure to reduce the heating demand by ensuring it is as insulated and airtight (not draughty) as possible. Then look at how to best supply this demand.

bigbru

Yep Micktheman, going to get the place insulated as well - attic definitely, possibly bead fill for the cavity. Windows are already uPVC double-glazed.

Fact remains that the heating system is ancient and needs to be replaced with a modern efficient one...

Slig

bigbru wrote: »

Would it not be prudent to keep a tank with an electric immersion heater in it, as a back up if the boiler or gas supply failed?
And if you remove the tank from the hot-press, is it no longer a hot-press... seeing there's nothing hot in it any more?

A properly insulated HWC will give off very little heat anyway. If you intend to redo the plumbing then maybe put a small rad into the hot press instead. It will provide much more heat and leave alot more room

bigbru

Slig, that's exactly what I was thinking - put a small rad with TRV in the hot-press.

My only problem then is that there would be no electrical immersion heater as back up, but I suppose that is something I could consider living with..

golf998

Hi guys first time posting any advise on how to wire an external timer to a worcester 24i combi boiler thks

muffler

Moved from Construction & Planning to Plumbing & Heating

golf998

many tks for reply im down the clare side so i think a bit far for you

JohnnieK

bigbru wrote: »

Would it not be prudent to keep a tank with an electric immersion heater in it, as a back up if the boiler or gas supply failed?
And if you remove the tank from the hot-press, is it no longer a hot-press... seeing there's nothing hot in it any more?

You could fit a tank fed electric shower as a back up.

Combi boilers are good. You have to me mindful of mains water pressure and flow rate. Connecting the boiler to the hot pipe under the kitchen sink will not suffice as it will not deliver the correct flow rate to the rest of the house if two points are used together.

I normally install them with a break tank and whole house booster, this also eliminates any unequal pressures between the cold and the hot at mixer taps and showers.