What size system boiler

[Tally101]

So we have a Vaillant eco tea plus 615 system boiler just had a new pump as it wasn't heating all rads. Just been online looking at the websites offering new boilers
one sized my house with 17 rads 1 bath 2 showers as 18kw, Boxt was 18kw and another well known states 30 kw
Which do you believe ?
thanks

 

[Swwils]

30kw is enough for 5 decent sized houses.

 

[Tally101]

Wow . so 15kw we have is ok?

 

[Mottie]

Wow . so 15kw we have is ok?

Is it working okay now that the pump has been replaced?

 

[Tally101]

I would say 2 out of 3 column rads are red hot one is hot but not as hot hot as I would expect but I still hear a bit of water gurgles now and again through the rads , I have installed auto rads vents to 2 downstairs and 2 upstairs rads

 

[vulcancontinental]

Wow . so 15kw we have is ok?

Is it working okay now that the pump has been replaced?

So we have a Vaillant eco tea plus 615 system boiler just had a new pump as it wasn't heating all rads. Just been online looking at the websites offering new boilers
one sized my house with 17 rads 1 bath 2 showers as 18kw, Boxt was 18kw and another well known states 30 kw
Which do you believe ?
thanks

Get a decent local heating engineer in and get a heat loss calculation done. The internet is convenient but how on earth can it be accurate when assessing a central heating system or upgrade.

 

[JohnD]

So we have a Vaillant eco tea plus 615 system boiler just had a new pump as it wasn't heating all rads. Just been online looking at the websites offering new boilers
one sized my house with 17 rads 1 bath 2 showers as 18kw, Boxt was 18kw and another well known states 30 kw
Which do you believe ?
thanks

Perhaps the 30kW was for a combi.