Suggest gas combi boiler

[Depo]

Thank you very much Ray, your post was excellent.

 

[snowhead]

What I`m trying to achieve - if I shower and somebody opens a kitchen tap, water flow doesn`t drop in shower and still keeps running at xxL/min at xx degrees.

The only way you'll get close to that is by having a boost pump just for the water inlet to the Combi.
Even then it won't be guaranteed.

 

[wattsie1987]

What I`m trying to achieve - if I shower and somebody opens a kitchen tap, water flow doesn`t drop in shower and still keeps running at xxL/min at xx degrees.

Flow restrictors are the only way to achieve this. ecotec plus and pro use the same internal components plastic to metal wise. They are my boiler of choice though.

 

[Depo]

As per Ray`s post, its not a problem with amount of water supply to the boiler, but kw of boiler itself - ability to heat XX L water at xx degrees per min.

 

[ShaunCorbs]

What I`m trying to achieve - if I shower and somebody opens a kitchen tap, water flow doesn`t drop in shower and still keeps running at xxL/min at xx degrees.

unvented system

 

[ShaunCorbs]

There are some big flats around mate.

oooo they defo must be outside of wales all little shacks round here 😀

 

[Depo]

Flow restrictors are the only way to achieve this. ecotec plus and pro use the same internal components plastic to metal wise. They are my boiler of choice though.

I have looked at Hansgrohe shower heads and taps - they seem to have water saving/reduction cartridges inside. Mixing water with air or something like that.

I`m leaning towards Viessmann Vitodens-100W. It ticks all the boxes, buts its 1:4, not 1:6.

 

[ShaunCorbs]

I have looked at Hansgrohe shower heads and taps - they seem to have water saving/reduction cartridges inside. Mixing water with air or something like that.

I`m leaning towards Viessmann Vitodens-100W. It ticks all the boxes, buts its 1:4, not 1:6.

so ?????? its still very energy efferent that all what matters

 

[wattsie1987]

Do you even know the flow rate at the main incoming? Combis are not the most efficient for under floor due to hot water priority causing temp to drop away. Your asking a lot expect to pay a lot!

 

[Scott_D]

What setup do you have at the moment?

 

[Depo]

so ?????? its still very energy efferent that all what matters

But its not most energy efficient. The difference is 8.3% from your boilers kw output. It all adds up. I would also like a boiler with passive flue gas heat recovery +it to work in condensing mode for hot tap water as well, but that`s asking too much 😀 Then I would need to manufacture one myself.

 

[Depo]

Do you even know the flow rate at the main incoming?

No.

Combis are not the most efficient for under floor due to hot water priority causing temp to drop away.

I`ve read quite opposite. Because UFH requires much lower water temp, boiler works in condensing mode, which is very efficient.

 

[Depo]

What setup do you have at the moment?

Electric heaters and electric shower.

 

[gassafe]

You need the the Ferroli Lamborghini boiler... If there no longer making that you need a Ravenheat...

 

[ShaunCorbs]

You need the the Ferroli Lamborghini boiler... If there no longer making that you need a Ravenheat...

😀 you can pick a colour as well

 

[Depo]

You need the the Ferroli Lamborghini boiler... If there no longer making that you need a Ravenheat...

Lambo not being made any more. Just checked Ferroli top boiler - Modena HE. Not impressed. 27kw uses 100w when burning. No w specified when idle. Also just 11.1L/min@35 isnt anything impressive. Noise level not specified at all. Doesn`t mention if heat exchanger is stainless steel or aluminum.

Ravenheat uses aluminum heat exchanger, not option for me, I only want best 🙂 Worcester also uses aluminum only, every model.

 

[Depo]

ecotec plus and pro use the same internal components plastic to metal wise.

Vaillant tech rep told me this over the phone - Pro is cheaper because it uses more plastic parts rather than brass/copper.

 

[drip-dry]

Vaillant tech rep told me this over the phone - Pro is cheaper because it uses more plastic parts rather than brass/copper.

Think maybe he just wanted you off the phone
:stooge_moe:

 

[IDCHAPPY]

The boiler you want doesn't exist, you'll have to compromise.

 

[Ray Stafford]

I want a car that seats 7, gives 90 mpg, does 0-60 in 4 secs, has 4WD, 25,000 mile service intervals, costs under £8k and offers a 7 yr unlimited mileage warranty.

All of those features are available. You just can't have them all in the same car.

My personal view is that you are misunderstanding the various claimed features of boilers. BOILERS don't have set efficiencies, except on a test rig. Its the INSTALLED SYSTEM that has an efficiency, and that depends on design, installation, commissioning, controls (both in terms of capability, but more importants user understanding) as well as a host of other issues - apart from the system.

If you will forgive me for saying so, this is a classic case of a little bit of knowledge being a dangerous thing.