I need to have a new heating system installed and have begun doing some
research.

There are 12 radiators which I have sized using information of the
Internet and had them checked by local plumber merchants. Heating
requirement for rads is 19kW. We have one family bathroom that will
have a separate shower cubicle, we also have an additional shower room
but that will utilise an electric shower. The property was built in
1890s and is a mid terrace has four floors (or three and a cellar) There
are two rooms in the cellar one used as an office the other as a utility
room.

Plumbers merchant is suggesting a 35kw boiler and having looked at
various models I am leaning toward the Viessmann Vitodens 100-W
condensing combi. Previously we have had Vaillant boilers and never had
any trouble with them.

I am now thinking of the controls system for the installation and would
appreciate some advice.

1 TVRs and a room stat? If so where is the best place for a room stat.
The house is usually occupied most days as I work from home and wife
works part time.

2 Should I be considering zoning?

Many thanks
--
BL