Gas pipe from Mains.

septictank

Quick question, about to get a new boiler install, why would I need to change the pipe from the road to the house fron 1/2" to 3/4" from out side the door to under the stairs and maybe the feed to new boiler?

Dardania

septictank wrote: »

Quick question, about to get a new boiler install, why would I need to change the pipe from the road to the house fron 1/2" to 3/4" from out side the door to under the stairs and maybe the feed to new boiler?

Pressure drop in the existing 1/2" could be too high for the flow that's required.
Are you replacing a system boiler with a combi hot water generating boiler by any chance? They require a greater gas flow.
Or did you install a gas hob since the current boiler was last fitted?

septictank

The Installer was talking about a combi but I don't know if i want that, a regular set up suits me better I think, what advantages are there with a combi? Already have hob and oven on gas. 4 bed house 11/12 rads 3 bathrooms.

rightjob!

septictank wrote: »

The Installer was talking about a combi but I don't know if i want that, a regular set up suits me better I think, what advantages are there with a combi? Already have hob and oven on gas. 4 bed house 11/12 rads 3 bathrooms.

3/4 gas pipe is needed for most gas boilers and especially a combi.
If you are happy with your current set up stick with a boiler and zone controls.
Depending on the house you will get the grant of €700 too

septictank

rightjob! wrote: »

3/4 gas pipe is needed for most gas boilers and especially a combi.
If you are happy with your current set up stick with a boiler and zone controls.
Depending on the house you will get the grant of €700 too

It's an old heating system and doesn't have the modern valve controles on the rads. I'm putting in a new boiler as old one is not working, Will I have to replace all the old controls on the old rads with new ones to get the grant as the old ones all work fine.

Dardania

septictank wrote: »

rightjob! wrote: »

3/4 gas pipe is needed for most gas boilers and especially a combi.
If you are happy with your current set up stick with a boiler and zone controls.
Depending on the house you will get the grant of €700 too

It's an old heating system and doesn't have the modern valve controles on the rads. I'm putting in a new boiler as old one is not working, Will I have to replace all the old controls on the old rads with new ones to get the grant as the old ones all work fine.

Yes you'll either have to replace the old rad valves, or you can fit zone valves & thermostats (e.g. 1 upstairs, 1 downstairs, and 1 for the hot water cylinder). Honestly, a combination of both replacing rad valves and fitting a minimum of 2 zone valves (1 for space heating and one for hot water cylinder) is best solution. It enables better control of space temperatures (by preventing overheating), and you don't feel guilty about leaving boiler on for extended periods of time, as you know you're not going to waste too much energy.
See: https://www.seai.ie/grants/home-grants/better-energy-homes/heating-upgrade-grants/ 
http://www.seai.ie/resources/publications/20170804_Code-of-practice-technical-Specification-rev-7-2.pdf

If you have any future aspirations for fitting solar panels, it would be easier to have a cylinder in place, with plumbing to suit rather than committing to a combi boiler.

A combi boiler is great, but it is usually more suited to smaller homes where the hot water demand is not likely to be as high - sometimes they can not sustain an adaquete flowrate if more than 1 user is demanding hot water. Also, you usually have to fit a booster pump for water - additional cost & noise.
It's be interesting to ask your plumber for the cost delta to fit a system boiler and rad / zone control valves (incl. SEAI grant) vs. the combi boiler + new gas mains cost - I suspect system boiler with controls route might be cheaper.

septictank

I'm going to go with a convenional boiler, think it is the best option, god knows what laws might be around the corner solar wise as you say.

I'll have to study up a bit, have a few days before anything happens.