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Sounds great, lets just focus on the combi option, what combi would be ideal considering sporadic usage, i would also like to consider an option to cotrol the heating/boiler wirelessly so the heating can be controlled from the main house. thanks for all your help

His comment was i looked at your mains gas pipe coming in and its 'fine' (trench dug up), i am still waiting to receive the GT1 survey report. Would you care to share those 'other options'? Thanks

Plumber/GE recomending Vaillant ecofit pure 825 combi, he thinks its about £100 difference if I were to do with the Ideal Standard, any thoughts? cheers

I guess thats the best way to describe it, i would not mind putting 24KW combi, my question was would (generally) the gas supply is sufficinet to support 2 boilers and a gas cooker? (one system, other combi).

Oh well, what can i say, i am guided by the expert. I am not too concern about what i want, trying to understand what I need given my requirements. No its not a granny flat, it’s a multipurpose 7x7M outbuilding with a separate bathroom and a gym room.

I didn't think i needed 24KW boiler, i was advised by the plumber/HE that i need 24KW boiler. Is there a way to work out gas vs electric cost effectiveness?

I guess that was the intention at the outset, available vs requirement, we know the requirement, 24KW boiler, enough to serve additional CH/HW requirements.

Thanks Tony What size smaller heat only boiler? Did not realise that it would be simpler and cost effective to have a new supply and pay the standing charges. Gas there so we can have CH and ho shower Shower facility. Nothing against leccy, dont think electricity cheaper option.

GT1 Survey requsted, results expected next week. BTW when the report comes what parameters i need to look out? Cheers

sorry, should been GT1 Survey!

OK great, would getting SG1 servy done help to get the required variables/parameters?

thanks, Madrab, will consider this, is there way to find out average household gas pressure can support in KW?

Hello, Am getting new outbuilding (about 25M away from the main building) built. I would like to take gas and water to the outbuilding. My question concerns is would our current meter/gas pressure could support additional boiler (hot water/heating) or we need to consider upgrading the gas...

Thanks Tony, i guess you suspected my liking for UFH, the combo approach is a good compromise. I was willing to let go UFH becaues I like wood flooring and realise that UFH/wood flooring is not an ideal combination so naturally thinking that by ditching the UFH I could go for the wood flooring...

Thanks Andrew, i guess the GSHP is out of the equation on both front, available area of land/cost. Yes agree with your logic, it certainy make sense to have more UFH pipe per m² in the bathroom. I am now leaning towards the traditional rads, yes change of heart here :-), considering we needed to...

Tony you have not given up on traditional rads, i guess evidence here suggest that we go back to the drawing board and look at the feasibility of UFH once again. Surprise by the fact that 'Heat pump will always be more expensive than gas', i guess like many things, this is also a hype! I let...

Yes Andrew i guess 49M2 would have to be divided in to multiple zones, i am looking to achieve max efficiency. Great, i will pay more attention to Ground source, i have the space (20M), assume there is enough evidence out there which justify the spend?

Thanks Tony i appreciate what you are getting at, slightly off topic but still relevant. Does the expert think the heat pumps (air/ground) is matured technology to be considered cost effective option for firing the UFH?

Thanks Andrew, yes i am hoping to utilise the new technology (remote/net controls) so its encouraging to know that wet UFH could be an option, we are looking at wet room for the shower so UFH would be ideal. Any recommendations for (49M2 coverage) wet UFH system combined with remote/net controls?

Thanks Tony, yes we are convinced that the usage will be heavy comes winter or summer. The new build is adjacent to existing garage (double) so we are thinking to adding couple of rads to garage while the garage is also getting insulated/facelift as part of renovation. As for the combi boiler...