Ideal Logic+ 35 Vs Vogue 40kw

[hyperbole]

Thanks for the input everyone.
I think our property is well insulated and I do understand the importance of preventing heat loss. But very interesting insights @hometech

To be honest I am not that concerned about the heating, it's the water flow rates that am more worried about. I am sure if I spend time working out the requirements for heat properly I will end up with a small number and a combi most suited for this will have low DHW output and flow rate. So I think I have to overspec anyways.

 

[hyperbole]

Looks like the Vogue is a much better model so the choice now is probably between the 32kw with 13l/min and 40kw with 16l/m.

How noticeable will this difference of 3l/m be in the real world? I have no way of gauging this.

Regarding modulation, from what I understand, as my smart thermostat (Tado) tries to reach desired temperature in the room it will taper the demand from the boiler as it gets closer to reaching that temperature as not to "overshoot". My thinking is that the better the boiler's modulation the more granular this tapering can be and less gas used and wasted (overshooting).

So if the boiler spec says

Min/max 4.6 - 26.0kW

Min/max 5.7 - 32.0kW

Are there levels within those ranges? If so, how many?
Or is that not how it works?

 

[SJB060685]

Have you considered a Viessmann 111 wall mounted storage combi? Flow rate of up to 18 lpm and better modulation than the boilers mentioned above.

 

[hyperbole]

Have you considered a Viessmann 111 wall mounted storage combi? Flow rate of up to 18 lpm and better modulation than the boilers mentioned above.

No, looks very interesting! What are the disadvantages of a storage combi? Can in bypass the tank and provide DHW on demand if the water in the tank isn't warm enough? Does it constantly keep the water in the tank hot?

 

[ShaunCorbs]

No, looks very interesting! What are the disadvantages of a storage combi? Can in bypass the tank and provide DHW on demand if the water in the tank isn't warm enough? Does it constantly keep the water in the tank hot?

Boiler does it automatically

 

[Scott_D]

You can’t range rate the central heating output on Ideal boilers.
They start high and modulate down as the return begins to warm up.
You can easily add weather compensation and load compensation with Ideals own controls or opentherm controls.

 

[Jerry]

Get the vogue max with a 12 year warranty

You size an open vent or system boiler output to the size of the property. With a combi boiler, you buy more KW's to give you more hot water output.

Dont get a viessmann 111 or 222. if you are desperate to run 2 showers at the same time or run a bath, go the traditional route of a boiler and cylinder.

A combi is a compromise. its was designed to save space for small spaces. if you have more than 1 bathroom, then usually a combi is not for you.

 

[vanhulle]

Looks like the Vogue is a much better model so the choice now is probably between the 32kw with 13l/min and 40kw with 16l/m.

How noticeable will this difference of 3l/m be in the real world? I have no way of gauging this.

Regarding modulation, from what I understand, as my smart thermostat (Tado) tries to reach desired temperature in the room it will taper the demand from the boiler as it gets closer to reaching that temperature as not to "overshoot". My thinking is that the better the boiler's modulation the more granular this tapering can be and less gas used and wasted (overshooting).

So if the boiler spec says

Min/max 4.6 - 26.0kW

Min/max 5.7 - 32.0kW

Are there levels within those ranges? If so, how many?
Or is that not how it works?

Did you go for the Vogue 40kw or 32kw in the end?

I'm in a very similar position as I have to replace my combi and have been recommended a Vogue and would prefer not to drop DHW down from our current 14.5l/min (with our old Vaillant that needs replacing).

 

[hyperbole]

Did you go for the Vogue 40kw or 32kw in the end?

I'm in a very similar position as I have to replace my combi and have been recommended a Vogue and would prefer not to drop DHW down from our current 14.5l/min (with our old Vaillant that needs replacing).

No, decided to go for Viessmann Vitodens 100-W 35kW Combi as it can modulate down to 3.2kw