Microbore or 15mm pipes & which boiler? *Now with added queries!*

Canucklehead

thechippy wrote: »

With all due respect to other posters - none of us have seen the site!!

Good morning: As I stated in this post 'A RGI recommended to you by a source you trust would be best placed to advise you after completion of a site survey.' Very few of us have had the opportunity to conduct a site survey and quote on a job for a MSEr...folks post on here for advice and it is up to them to weigh the options. If you take a look through the threads on this forum you'll see that many posters have been stitched up by the unscrupulous/incompetent or been given poor advice by the inexperienced.

Canucklehead

Canucklehead

jamtart6 wrote: »

I think Im just concerned that there is an underlying reason e.g. its going to be too big a job and they wont get as much profit as they would if they just fitted the boiler. They all keep going on about what a pain the chipboard floors would be and they'd have to cut them?

Its quite hard when people tell you different things, as each one has said 15mm is what they usuall use to fit a new system but keep the microbore??Especially when you dont have a clue!!

Good morning: Chipboard floors are a pain but a reality in contemporary/renovated homes. You will get quotes based on a trade's experience (or inexperience) with a similar job. An experienced RGI/plumber shouldn't be fazed if he/she has the skills set to complete the job. A day's work is a day's work...how would the length of the job affect the profit margin The OH calculates how many days a job will take, adds in materials and other overheads then quotes a price. Many RGIs only fit boilers, they don't install central heating systems, service or repair often because they wouldn't know where to start.;)

Good luck with the next quote.

Canucklehead

Canucklehead

thechippy wrote: »

This property bears NO resemblance to the op's........

I have provided an example of what can happen if central heating issues are not addressed as part of a renovation....many other examples litter the forum and have cost MSErs lots of dosh and disruption. I hope the OP posts back with a post-installation update as we rarely hear about the end result and comments from someone who has had the work done are instructive for others in the same boat.

Canucklehead

roddydogs

"If you've got more than 1 Bedroom a Combi will Struggle?
" Surely it depends on the overall Btu needed, how many floors, etc, etc,?

Canucklehead

roddydogs wrote: »

"If you've got more than 1 Bedroom a Combi will Struggle?
" Surely it depends on the overall Btu needed, how many floors, etc, etc,?

Good morning: If you are quoting me
what I said was 'If you have more than 1 bathroom then most combis would struggle'
Boiler sizing is based on Central heating and DHW requirements...a 30 kW combi has more than enough output to heat a large property but sufficient DHW output in a property with higher DHW demands (i.e. simulataneous drawoff points) would be a concern for most combis.

HTH

Canucklehead

roddydogs

Canucklehead wrote: »

Good morning: If you are quoting me
what I said was 'If you have more than 1 bathroom then most combis would struggle'
Boiler sizing is based on Central heating and DHW requirements...a 30 kW combi has more than enough output to heat a large property but sufficient DHW output in a property with higher DHW demands (i.e. simulataneous drawoff points) would be a concern for most combis.

HTH

Canucklehead

Sorry...... Must read posts corrrectly

jamtart6

hopefully making a decision this week after plumber # 5's quote :eek:

my preferred plumber #1 forgot he was supposed to be giving me a quote and is now basically booked until April. boo he is annoyed that he forgot as he has had no work for the last 3 weeks either :rolleyes:

I will let you guys know what we end up doing as you have been so helpful:beer::T

EliteHeat

thechippy wrote: »

1kw = about 2400btu

I think that you will find that 1kW = 3414 BTU.

If your radiators are performing adequately, then there is no point in incurring the considerable expense of upgrading from microbore to 15mm even though the risk of blockages is undoubtedly increased with the 8/10mm pipe-work.

jamtart6

EliteHeat wrote: »

I think that you will find that 1kW = 3414 BTU.

If your radiators are performing adequately, then there is no point in incurring the considerable expense of upgrading from microbore to 15mm even though the risk of blockages is undoubtedly increased with the 8/10mm pipe-work.

The radiators are barely luke warm!! We have just moved in!

EliteHeat

jamtart6 wrote: »

The radiators are barely luke warm!! We have just moved in!

Hang on a sec, you haven't said what boiler you currently have and this is the first that I have heard that you have problems. Also, why are you convinced that you want / need a combi?