How to do Multiple zones with underfloor heating and hot water with tado?

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benlad
benlad ✭
in General Questions & Topics

We have the following newly fitted system:

a. Vaillant system boiler (ecoTEC Plus 637 ERP).

b. Unvented cylinder for hot water.

c. Four zone wet underfloor heating (ground floor).

d. One zone of radiators (first & second floors).  

e. The builder has fitted cabling for the themostats in the zones. One cable for each zone, so 5 in total (4 underfloor + 1 rads).


I am trying to figure out what is the best tado setup. Suggested setup:

1 x Starter Kit Wireless Smart Thermostat V3+

  - For radiators and hot water

  - It seems the wired smart thermostat cannot control hot water, so will have to blank wiring for rads thermostat and fit this.

4 x Tado Wired Smart Thermostat

  - For the underfloor heating zones


Some queries...

1) Is there a better setup?

2) Does this setup do the boiler modulation (if fitted correctly)? Anything the bear in mind?

3) Assume we cannot make use of wired smart thermostat for the radiators since we also need to control hot water?

4) Is there a recommended TRV brand/type for tado smart valves?

Answers

  • GrilledCheese2
    GrilledCheese2 ✭✭✭
    Options

    The devices you suggested will work with your setup, providing your heating engineer is planning to use a 230V control system.

    1) That's the best setup to control 5 heating zones and a hot water cylinder. However, check with your heating engineer if they plan to use an UFH wiring centre. Some of these use proprietary thermostats and won't be compatible with Tado.

    2) Tado boiler modulation is limited to a single zone and cannot do multi-zone. When 230V control is used the thermostat is energising the motorised valve for each zone. Low voltage digital interfaces cannot energise the motorised valves and rely on an additional controller to control the valves and pumps.

    3) You may be able to use the wireless receiver for HW only and use 5 wired thermostats. Check with Tado customer support. Having to use the radiator thermostat in wireless mode is not a problem. You simply loop the thermostat wiring in the back box and mount the wireless thermostat over the top.

    4) Buy TRVs with an M30 x 1.5 thread for the head (Honeywell and Drayton meet this requirement). This will avoid using an adapter ring. Mounting the TRV in the horizontal position is meant to give better temperature measurement than vertical mounting.

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