Boiler system suggestions to run 2 showers

abankerbutnotafatcat

Thank you so much. I feel like I should invite you round to try out one of the new showers when the house is finally done! One final question, I've never heard of Megaflo - I thought Vailent and WB were the best boiler brands?

Alex1983

Megaflo is a cyclinder brand manufacturered by heatrae sadia.

C_Mababejive

The idea often touted around that a combi is more efficient just simply is not the case.

fezster

abankerbutnotafatcat wrote: »

Thank you so much. I feel like I should invite you round to try out one of the new showers when the house is finally done! One final question, I've never heard of Megaflo - I thought Vailent and WB were the best boiler brands?

Megaflo is one of the most popular brands of unvented cylinder, but it's not personally one I would recommend (and I've got one). Its overpriced and you can get similar for a lot less money. If you have a Vaillant boiler fitted, I'd recommend pairing it up with a Vaillant unvented cylinder - they work in conjunction better.

Alex1983

To hunk about the vaillant tank as well, megaflo' are good but expensive. I fitted a gledhill 1 a while back that was 300 litres which was very good and reasonably priced and it recovered in 19mins.

Alex1983

*think about the vaillant.

ComicGeek

C_Mababejive wrote: »

The idea often touted around that a combi is more efficient just simply is not the case.

Based on what? You can't make that statement without further qualification, it really depends on what boiler models, hot water usage amount and patterns etc.

A good combi boiler with high summer dhw efficiency must be more efficient in most normal scenarios than a system boiler and cylinder, there are fewer losses involved.

bris

A system boiler and a 210 ltr unvented cylinder will be the best solution without a doubt.


That's my set up and it runs 2 showers without problems, recovery time is unnoticeable as the showers in our home go all the time.


Believe me the combi will not cut it, not even close and mine is a 42kw so we did try. We didn't need a new boiler though we just turned the combi into a system boiler, yes you can do that so if you already have a good combi a good engineer can just zone it for you.


We have ours on an S plan but if you want to control different parts of the houses heating the engineer can just add a zone using an S plan plus which means a thermostat in each zone controlling the areas you want to heat, you can add as many zones as you want.


There is a reason system boilers are still so popular, combis simply can't handle larger houses with a larger families hot water needs.

dggar

fezster wrote: »

Also remember that you're mixing hot and cold water in a shower. So if your shower delivers 20 l/min, approximately half of that will be hot water and the other half delivered cold direct from the mains. You can use this as a basis for calculating your hot water storage requirements.

Is this correct? I thought the cold side of a shower should be fed from cold water storage tank ( in the loft or airing cupboard) to guard against a failure of mains water pressure while using the shower. (and to also equalise the hot and cold water pressure fed to the shower.)

Alex1983

dggar wrote: »

Is this correct? I thought the cold side of a shower should be fed from cold water storage tank ( in the loft or airing cupboard) to guard against a failure of mains water pressure while using the shower. (and to also equalise the hot and cold water pressure fed to the shower.)

Unvented hot water is mains pressure, so there is no cold storage tanks, the cold comes off the cold main. It's the same as fitting a shower in a combi system.