diff --git a/includes/defines.h b/includes/defines.h
index 1294ad717..76f9c0750 100644
--- a/includes/defines.h
+++ b/includes/defines.h
@@ -120,6 +120,7 @@ typedef unsigned int pixel;
 #endif
 
 #define SDEUT
+//#define REALHEAT
 
 typedef unsigned char uint8;
 
diff --git a/includes/powder.h b/includes/powder.h
index 014f3bea6..d3e466057 100644
--- a/includes/powder.h
+++ b/includes/powder.h
@@ -443,8 +443,8 @@ static const part_type ptypes[PT_NUM] =
 	{"GLAS",	PIXPACK(0x404040),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	0.000f	* CFDS,	0,	0,		0,	0,	0,	1,	100,	SC_SOLIDS,		R_TEMP+0.0f	+273.15f,	150,	"Solid. Meltable. Shatters under pressure", ST_SOLID, TYPE_SOLID | PROP_NEUTPASS | PROP_HOT_GLOW, &update_GLAS},
 	{"PTCT",	PIXPACK(0x405050),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	0.000f	* CFDS,	0,	0,		0,	1,	1,	1,	100,	SC_ELEC,		R_TEMP+0.0f	+273.15f,	251,	"Semi-conductor. Only conducts electricity when cold (Less than 100C)", ST_SOLID, TYPE_SOLID|PROP_CONDUCTS|PROP_LIFE_DEC, &update_NPTCT},
 	{"BGLA",	PIXPACK(0x606060),	0.4f,	0.04f * CFDS,	0.94f,	0.95f,	-0.1f,	0.3f,	0.00f,	0.000f	* CFDS,	1,	0,		0,	5,	2,	1,	90,		SC_POWDERS,		R_TEMP+0.0f	+273.15f,	150,	"Broken Glass, Heavy particles. Meltable. Bagels.", ST_SOLID, TYPE_PART | PROP_HOT_GLOW, NULL},
-	{"THDR",	PIXPACK(0xFFFFA0),	0.0f,	0.00f * CFDS,	1.0f,	0.30f,	-0.99f,	0.6f,	0.62f,	0.000f	* CFDS,	0,	0,		0,	0,	0,	1,	1,		SC_EXPLOSIVE,	9000.0f		+273.15f,	251,	"Lightning! Very hot, inflicts damage upon most materials, transfers current to metals.", ST_NONE, TYPE_ENERGY, &update_THDR},
-	{"PLSM",	PIXPACK(0xBB99FF),	0.9f,	0.04f * CFDS,	0.97f,	0.20f,	0.0f,	-0.1f,	0.30f,	0.001f	* CFDS,	0,	0,		0,	0,	0,	1,	1,		SC_GAS,			9000.0f		+273.15f,	115,	"Plasma, extremely hot.", ST_NONE, TYPE_GAS|PROP_LIFE_DEC|PROP_LIFE_KILL, &update_PYRO},
+	{"THDR",	PIXPACK(0xFFFFA0),	0.0f,	0.00f * CFDS,	1.0f,	0.30f,	-0.99f,	0.6f,	0.62f,	0.000f	* CFDS,	0,	0,		0,	0,	0,	1,	1,		SC_EXPLOSIVE,	9000.0f		+273.15f,	1,	"Lightning! Very hot, inflicts damage upon most materials, transfers current to metals.", ST_NONE, TYPE_ENERGY, &update_THDR},
+	{"PLSM",	PIXPACK(0xBB99FF),	0.9f,	0.04f * CFDS,	0.97f,	0.20f,	0.0f,	-0.1f,	0.30f,	0.001f	* CFDS,	0,	0,		0,	0,	0,	1,	1,		SC_GAS,			10000.0f		+273.15f,	5,	"Plasma, extremely hot.", ST_NONE, TYPE_GAS|PROP_LIFE_DEC|PROP_LIFE_KILL, &update_PYRO},
 	{"ETRD",	PIXPACK(0x404040),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	0.000f	* CFDS,	0,	0,		0,	1,	1,	1,	100,	SC_ELEC,		R_TEMP+0.0f	+273.15f,	251,	"Electrode. Creates a surface that allows Plasma arcs. (Use sparingly)", ST_NONE, TYPE_SOLID|PROP_CONDUCTS|PROP_LIFE_DEC, NULL},
 	{"NICE",	PIXPACK(0xC0E0FF),	0.0f,	0.00f * CFDS,	0.90f,	0.00f,	0.0f,	0.0f,	0.00f,	-0.0005f* CFDS,	0,	0,		0,	0,	20,	1,	100,	SC_SOLIDS,		35.0f,					46,		"Nitrogen Ice.", ST_SOLID, TYPE_SOLID, NULL},
 	{"NBLE",	PIXPACK(0xEB4917),	1.0f,	0.01f * CFDS,	0.99f,	0.30f,	-0.1f,	0.0f,	0.75f,	0.001f	* CFDS,	0,	0,		0,	0,	1,	1,	1,		SC_GAS,			R_TEMP+2.0f	+273.15f,	106,	"Noble Gas. Diffuses. Conductive. Ionizes into plasma when introduced to electricity", ST_GAS, TYPE_GAS|PROP_CONDUCTS|PROP_LIFE_DEC, NULL},
diff --git a/src/powder.c b/src/powder.c
index 5b81890a4..3acad8e82 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -1684,8 +1684,15 @@ void update_particles_i(pixel *vid, int start, int inc)
 
 				//heat transfer code
 				h_count = 0;
+#ifdef REALHEAT
+				if (t&&(t!=PT_HSWC||parts[i].life==10))
+				{
+					float c_Cm = 0.0f;
+#else
 				if (t&&(t!=PT_HSWC||parts[i].life==10)&&ptypes[t].hconduct>(rand()%250))
 				{
+					float c_Cm = 0.0f;
+#endif
 					if (aheat_enable)
 					{
 						c_heat = (hv[y/CELL][x/CELL]-parts[i].temp)*0.04;
@@ -1705,12 +1712,24 @@ void update_particles_i(pixel *vid, int start, int inc)
 						        &&(rt!=PT_FILT||(t!=PT_BRAY&&t!=PT_PHOT&&t!=PT_BIZR&&t!=PT_BIZRG)))
 						{
 							surround_hconduct[j] = r>>8;
+#ifdef REALHEAT
+							c_heat += parts[r>>8].temp*96.645/ptypes[rt].hconduct*fabs(ptypes[rt].weight);
+							c_Cm += 96.645/ptypes[rt].hconduct*fabs(ptypes[rt].weight);
+#else
 							c_heat += parts[r>>8].temp;
+#endif
 							h_count++;
 						}
 					}
-
+#ifdef REALHEAT
+					if (t == PT_PHOT)
+						pt = (c_heat+parts[i].temp*96.645)/(c_Cm+96.645);
+					else
+						pt = (c_heat+parts[i].temp*96.645/ptypes[t].hconduct*fabs(ptypes[t].weight))/(c_Cm+96.645/ptypes[t].hconduct*fabs(ptypes[t].weight));
+					
+#else
 					pt = parts[i].temp = (c_heat+parts[i].temp)/(h_count+1);
+#endif
 					for (j=0; j<8; j++)
 					{
 						parts[surround_hconduct[j]].temp = pt;