combi vs megaflow boiler system

vermas

Hi

I am buying a detached house with 3 bedrooms which will be extended in about 2 years into a 5 bedroom 2 bathroom house
I am getting all the donwstairs work done now including new kitchen etc as the extension in the future will just be to the first floor
I have been told to get a megaflow system- is this really much better and worth the extra cost from just a really good combi boiler- what is the main difference- just the ability for two people to shower at the same time without water cutting out and additional pressure I assume- is it worth the extra £2k for this. Currently two adults and two children living in the house and so not really heavy concurrent usage- also I may only be there for 5 years- just wandering what people would recommend to go for
If I do go for Megaflo what boiler should I choose from and what size tank
The other option is to go for a cheap combi for 2 years then when I get the extension done upstairs to change to megaflo then- concern is that they may need to rip ot flooring, kitchen etc which are not being changed- is there any way of buying a combi now that I can use and then easily with minimum disruption switch to a megaflo system or will the fact that I need new pipes etc mean ripping out the floors etc etc and thus make more mess?

slee497

Vermas

You really need to get a heating installer to visit you to look at your property and to explain the different options. I wouldn't recommend fitting a combi into a house of your size. A megaflow (or similar) can be run off either a system boiler (not a combi) or just electric (economy 7 and daytime boost.) You can get really good combi boilers but combi vs megaflow will depend on the water pressure that your local water authority is supplying and this can vary a lot. They have to supply 1 bar miniumum. There really are two many factors to be able to give a detailed explanation via this forum. Good luck.

vermas

Thanks for the advice - if the water pressure is good will a good combi suffice for 5 bed 2 bathroom house

also can you just confirm the main advantages- is it just being able to have two people using water at the same time in which case with a household with 2 adults and 2 kids it prob wouldnt be worth it as the prob of having a shower at the same time is very low and may happen once a month....

robv_3

Combi's are ok for supplying water for one shower but it takes ages to fill a bath and turning on another hot tap will effect all the other outlets. I would never install a combi in any place with more than one bathroom.

Two kids! teens are some of the highest uses of water, girls taken long baths and boys long hot showers

Megaflow vs Combi. The combi does not get off the start line before the megaflow finishes. Another option is a heatbank / thermstore.

Make sure you supply is 2bar plus and can supply 20l/m (30 recommended). If it can not just stay with a conventional system which will beat a combi in a multiple bathroom house. With a conventional system you will need pumps to make a decent shower.

plumb1_2

Forget the combi, go for a megaflow(generic term) system.
Your plumber will give advice on the type of boiler and tank, we all have our prefered makers.

gartshore

you can have the best of both worlds you can combine a combi & an unvented cylinder by use of controls as canuckelhead will confirm .

Canucklehead

gartshore wrote: »

you can have the best of both worlds you can combine a combi & an unvented cylinder by use of controls as canuckelhead will confirm .

Good morning: Or a third allternative i.e. this from Alpha My OH, Corgi Guy, hasn't had the opportunity to fit one yet.

HTH


Canucklehead

EliteHeat

Canucklehead wrote: »

Good morning: Or a third allternative i.e. this from Alpha My OH, Corgi Guy, hasn't had the opportunity to fit one yet.

Good grief! that looks messy and it's not even piped up!

A Vaillant 937 is a good compromise if you want a combi.

Most heating installers would go with an unvented hot water system in their own homes if they had the money, water pressure and if they could be bothered to do it without getting paid

vermas

Thanks again - I will go for the megaflow i think as then i know that i will have the best- what is the worcester bosch boiler that i would need to get to go with the tank or other similar good unit for that matter?

Canucklehead

EliteHeat wrote: »

Good grief! that looks messy and it's not even piped up!

A Vaillant 937 is a good compromise if you want a combi.

Most heating installers would go with an unvented hot water system in their own homes if they had the money, water pressure and if they could be bothered to do it without getting paid

Good morning: Haven't you seen one until now?;) We'd always stick with a combi if mains pressure is good...frees up space and more efficient for our purposes...everyone has their preferred options and varying DHW requirements. OH has quoted on the 937 but hasn't had a bite as folks down here see it as an expensive option

To the OP: Depends on your requirements...WB has a range of regular and system condensing boilers here Your CORGI will advise you after assessing your DHW and heating demands.

HTH

Canucklehead

plumb1_2

EliteHeat wrote: »

Most heating installers would go with an unvented hot water system in their own homes if they had the money, water pressure and if they could be bothered to do it without getting paid

Very true. Never been a lover of combi's.