For specification choose the type of UNIT then the appropriate MODEL.

Combination Unit - Use in new-build situations or where no remote primary feed &
expansion tank exists. Primary Feed and Expansion Tank must be 500mm above top of radiators.
OR
Cylinder Unit - Use when there is an existing remote primary feed & expansion tank. Working head of system must be given when specifying/pricing.
AND
Boiler Model: Use when space heating and hot water are required. Suitable for oil, gas and certain solid fuel boilers. Specify if boiler is Vented or Sealed System.
OR
Electric Model: Use when no space heating is required. Supplied with twin immersions to take advantage of low cost tariffs.
e.g.. a location with no loft space and a gas boiler would need a Combination-type, boiler model.

SIZING GUIDE:

Cylinder Reference	Boiler Model	Electric Model
THERMflow 120	1/2 bedroom. Bath or Shower Boiler sizing requirements: Allow 4kW for Hot Water	1 bedroom. Shower Only
THERMflow 140	2/3 bedroom. Bath or Shower Boiler sizing requirements: Allow 5kW for Hot Water	1/2 bedroom. Shower Only
THERMflow 180	3/4 bedroom. Bath or Shower Boiler sizing requirements: Allow 6kW for Hot Water	1/2 bedroom  Bath or Shower
THERMflow 210	4/5 bedroom. Bath or Shower Boiler sizing requirements: Allow 7kW for Hot Water	2/3 bedroom  Bath or Shower

Supplied as standard with all THERMflow units:

• servicable strainer
• non-return valve
• expansion chamber
• thermostatic mixing valve
• connecting pipework
• Isolating valve*
• Ballvalve, float & overflow*
• 2 immersion heaters fitted - (electric models only)
• probe-type cylinder thermostat - (boiler models only)
• Double thickness CFC free insulation.

• 1. Immersion Heater supplied with Boiler Model.
• 2. Double Pump Kit (not fitted): two Grundfos 15-50 circulating pumps, programmer and wiring centre.
• 3. Double Pump Kit (fitted): two Grundfos 15-50 circulating pumps pre-wired with the cylinder thermostat to a wiring centre, with the programmer supplied separately.