Loose Wire System Size Guide

In order to determine the type of heater and number of thermostats required for your floor, measure the area to be heated.

Remember not to include areas where fixed elements will be placed such as kitchen or bathroom units.  Please refer to the table below for sizing details.

Underfloor Heaters (Loose Wire):

Net Heated Area (m2)	kW	Warmup® Heaters Required
1.5 - 2.4	0.300	1xDWS300
2.5 - 3.4	0.400	1xDWS400
3.5 - 4.4	0.600	1xDWS600
4.5 - 5.9	0.800	1xDWS800
6.0 - 6.9	1.000	1xDWS600 + 1xDWS400
7.0 - 8.4	1.200	2xDWS600
8.5 - 9.9	1.400	1xDWS800 + 1xDWS600
10 - 11.4	1.600	2xDWS800
11.5 - 12.9	1.800	1xDWS800 + 1xDWS600 + 1xDW4800
13.0 - 14.4	2.000	2xDWS800 + 1xDWS400
14.5 - 15.9	2.200	2xDWS800 + 1xDWS600
16.0 - 17.4	2.400	3xDWS800
17.5 - 18.9	2.600	2xDWS800 + 1xDWS600 + 1xDWS400
19.0 - 20.4	2.800	3xDWS800 + 1xDWS400
20.5 - 21.9	3.000	3xDWS800 + 1xDWS600
22.0 - 25.0	3.200	4xDWS800