diff --git a/viewer/Smart Thermostats.html b/viewer/Smart Thermostats.html
index 920f290..c3d3550 100644
--- a/viewer/Smart Thermostats.html	
+++ b/viewer/Smart Thermostats.html	
@@ -67,11 +67,11 @@
 			data: data.heater.historic.map(function (item) {
 				return {
 					x: +(new Date(item.Date)),
-					y: (item.Data=="On" || item.Data.startsWith("Set Level"))?((item.Level==undefined)?100:(item.Level>100?100:item.Level)):0
+					y: (item.Data=="On" || item.Data.startsWith("Set Level"))?((!data.heater.isDimmer)?100:(item.Level>100?100:item.Level)):0
 				}
 			})
 		});
-		console.log(series);
+		//console.log(series);
 		chartElement.highcharts({
 			chart: {
 				zoomType: 'x'
diff --git a/viewer/svt_viewer.js b/viewer/svt_viewer.js
index 58f479c..474a26c 100644
--- a/viewer/svt_viewer.js
+++ b/viewer/svt_viewer.js
@@ -15,6 +15,7 @@ class Thermostat {
 class Heater {
 	constructor() {
 		this.historic=undefined;
+		this.isDimmer=false;
 	}
 }
 Date.prototype.yyyymmdd_hhmm = function() {
@@ -90,8 +91,9 @@ function getThermostats() {
 					$.ajax({url: request,
 						async: false,
 						success: function(resultTemp){
-							console.log(resultTemp);
+							//console.log(resultTemp);
 							thermostat.heater = new Heater();
+							//thermostat.heater.isDimmer = resultTemp.HaveDimmer; // not working, HaveDimmer always true
 							thermostat.heater.historic = resultTemp.result.filter(item => new Date(item.Date).getTime() >= minDate).sort((a,b)=>new Date(a.Date).getTime()>new Date(b.Date).getTime());
 						}
 					});
@@ -109,7 +111,9 @@ function getThermostats() {
 											thermostat.setpoint = resultTemp2.result;
 										}
 									});
-									
+								}
+								if(heatIdxs[0] == resultTemp.result[j].idx) {
+									thermostat.heater.isDimmer = resultTemp.result[j].SwitchType == "Dimmer";
 								}
 							}
 						}