I want to install a combi boiler for heating and water. Can anyone help
with size selection please?

I have just moved into a small 3 bed semi which at the moment does not
have a gas supply. I am waiting for the supply to be connected. There
is just storage heating at the moment.

Thanks in advance for any help!

Liam McGuinness

the Worcester Bosch web site has a wizard which walks you through boiler
selection, and then suggests suitable models, from their own range of
course.
http://www.worcester-bosch.co.uk/ind... from_id=10227

HTH.



"Willem Dafoe" wrote in message
oups.com...
I want to install a combi boiler for heating and water. Can anyone help
with size selection please?

I have just moved into a small 3 bed semi which at the moment does not
have a gas supply. I am waiting for the supply to be connected. There
is just storage heating at the moment.

Thanks in advance for any help!

Liam McGuinness

"Willem Dafoe" wrote in message
oups.com...
I want to install a combi boiler for heating and water. Can anyone help
with size selection please?

I have just moved into a small 3 bed semi which at the moment does not
have a gas supply. I am waiting for the supply to be connected. There
is just storage heating at the moment.

Thanks in advance for any help!

Liam McGuinness

Do you take baths a lot? Showers a lot?

lots of showers, but not baths.

Doctor Drivel wrote:
"Willem Dafoe" wrote in message
oups.com...
I want to install a combi boiler for heating and water. Can anyone help
with size selection please?

I have just moved into a small 3 bed semi which at the moment does not
have a gas supply. I am waiting for the supply to be connected. There
is just storage heating at the moment.

Thanks in advance for any help!

Liam McGuinness

Do you take baths a lot? Showers a lot?

"Willem Dafoe" wrote in message
oups.com...

lots of showers, but not baths.

If you have occasional baths and mostly showers then a 30kW combi will do
fine. With a small house you want a boiler that modulates down low on CH to
prevent excessive boiler cycling when on CH - the boilers are way over
powered for a small house. You don't want a constant click-click of the
cycling all night. The excessive power is to heat water instantly, so
modulating to a low kW is important.

The Glow Worm 30CXI (rebadged Vaillant) modulates down to 5kW. It has a one
piece stainless steel heat exchanger.

I would go for the Glow Worm 30CXI @ 12.3 litres/min flow rate. Great for
showers, fills a bath leisurely but not painfully slow, quicker in summer.
However the filling time you get used to. You can fill to 1/3 and get in as
the bath is still filling - amazing how many never think of that.

The 38CXI gives 15.5 litres/min DHW flowrate, but only modulates down to
6kW. If you take mainly baths then the 38kW is what you want. Fit a
Honeywell CM67 stat programmer no matter what boiler, which also has anti
cycle control incorporated.

Assuming you have a decent cold water pressure/flow.