diff --git a/src/main.cpp b/src/main.cpp
index 960c137..b9c5ecb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,8 +3,10 @@
 #include "reactor/control/control_rod.hpp"
 #include "reactor/fuel/fuel_rod.hpp"
 #include "reactor/coolant/pipe.hpp"
+#include "reactor/coolant/vessel.hpp"
 #include "display.hpp"
 
+#include <cmath>
 #include <sstream>
 #include <unistd.h>
 #include <curses.h>
@@ -18,33 +20,60 @@ int main()
 	nodelay(stdscr, TRUE);
 	curs_set(0);
 	
+	sim::reactor::coolant::vessel vessel(100, 400);
 	sim::reactor::reactor<5, 5> reactor = sim::reactor::builder<5, 5>(
 		sim::reactor::fuel::fuel_rod(100, 400),
-		sim::reactor::control::control_rod(1000, 0.1),
-		sim::reactor::coolant::pipe(), {
-			" PPP ",
-			"PFCFP",
-			"PCPCP",
-			"PFCFP",
-			" PPP "
+		sim::reactor::control::control_rod(1000, 1),
+		sim::reactor::coolant::pipe(vessel), {
+			"## ##",
+			"#FCF#",
+			" C C ",
+			"#FCF#",
+			"## ##"
 		});
 
 	double secs = 0;
 
 	for(;;)
 	{
-		reactor.update(0.01);
 
 		std::stringstream ss;
-		ss << "Reactor Core: " << secs << " s\n";
+		ss << "Reactor Core\n\n";
 
-		secs += 0.01;
+		{
+			long mins = secs / 60;
+			double s = fmod(secs, 60);
+
+			long hours = mins / 60;
+			mins %= 60;
+
+			long days = hours / 24;
+			hours %= 24;
+
+			long years = days / 365;
+			days %= 365;
+
+			ss << "Time:\n";
+
+			if(years > 0) ss << years << "y ";
+			if(days > 0) ss << days << "d ";
+			if(hours > 0) ss << hours << "h ";
+			if(mins > 0) ss << mins << "m ";
+			
+			ss << s << "s\n\n";
+		}
+
+		reactor.update(1);
+		vessel.update();
+		secs += 1;
+		
+		ss << "Vessel\n" << vessel << "\n";
 
 		erase();
 		display::draw_text(1, 0, ss.str().c_str());
 
-		const int X = 3, Y = 4;
-		const int W = 32, H = 8;
+		const int X = 2, Y = 40;
+		const int W = 32, H = 10;
 
 		for(int x = 0; x < reactor.width; x++)
 		for(int y = 0; y < reactor.height; y++)
diff --git a/src/reactor/builder.hpp b/src/reactor/builder.hpp
index 64f1e6a..144ce1d 100644
--- a/src/reactor/builder.hpp
+++ b/src/reactor/builder.hpp
@@ -29,10 +29,10 @@ reactor<W, H> builder(fuel::fuel_rod fr, control::control_rod cr, coolant::pipe
 		case 'C':
 			r = new control::control_rod(cr);
 			break;
-		case 'P':
+		case ' ':
 			r = new coolant::pipe(p);
 			break;
-		default:
+		case '#':
 			r = new rod();
 		}
 
diff --git a/src/reactor/coolant/pipe.cpp b/src/reactor/coolant/pipe.cpp
index 0dd6385..a5d6d63 100644
--- a/src/reactor/coolant/pipe.cpp
+++ b/src/reactor/coolant/pipe.cpp
@@ -3,26 +3,33 @@
 
 using namespace sim::reactor::coolant;
 
+pipe::pipe(coolant::vessel& v)
+{
+	this->vessel = &v;
+	this->steam = 0;
+}
+
+void pipe::display(std::ostream& o) const
+{
+	o << "Steam: +" << steam  << "\n";
+}
+
 double pipe::get_k(val_t type) const
 {
-	switch(type)
-	{
-	case val_t::HEAT:
-		return 1.0 / 16.0;
-	case val_t::N_SLOW:
-		return 1.0 / 4.0;
-	case val_t::N_FAST:
-		return 1.0 / 2.0;
-	}
-
-	return 0;
+	return vessel->get_level() / vessel->get_volume();
 }
 
 void pipe::update(double secs)
 {
+	double v;
+	
 	update_rod();
+	
+	v = vessel->add_steam(vals[val_t::HEAT]);
+	steam = vals[val_t::HEAT] - v;
+	vals[val_t::HEAT] = v;
 
-	double v = vals[val_t::N_FAST];
+	v = vals[val_t::N_FAST];
 	vals[val_t::N_FAST] -= v;
 	vals[val_t::N_SLOW] += v;
 }
diff --git a/src/reactor/coolant/pipe.hpp b/src/reactor/coolant/pipe.hpp
index 7f24946..a06a186 100644
--- a/src/reactor/coolant/pipe.hpp
+++ b/src/reactor/coolant/pipe.hpp
@@ -1,6 +1,7 @@
 
 #pragma once
 
+#include "vessel.hpp"
 #include "../rod.hpp"
 
 namespace sim::reactor::coolant
@@ -8,12 +9,18 @@ namespace sim::reactor::coolant
 
 class pipe : public sim::reactor::rod
 {
+	coolant::vessel* vessel;
+	double steam;
+	
 	virtual double get_k(sim::reactor::rod::val_t type) const;
 	
 	virtual const char* get_name() const { return "Coolant"; }
+	virtual void display(std::ostream& o) const;
 
 public:
 
+	pipe(coolant::vessel& v);
+
 	virtual bool should_display() const { return true; }
 
 	virtual void update(double secs);
diff --git a/src/reactor/coolant/vessel.cpp b/src/reactor/coolant/vessel.cpp
new file mode 100644
index 0000000..e7bbd7a
--- /dev/null
+++ b/src/reactor/coolant/vessel.cpp
@@ -0,0 +1,43 @@
+
+#include "vessel.hpp"
+
+using namespace sim::reactor::coolant;
+
+vessel::vessel(double level, double volume)
+{
+	this->level = level;
+	this->volume = volume;
+}
+
+void vessel::update()
+{
+	level += level_in;
+	steam += steam_in;
+	level_in = 0;
+	steam_in = 0;
+}
+
+double vessel::add_steam(double amount)
+{
+	double th = get_pressure();
+
+	if(amount > th)
+	{
+		amount -= th;
+		steam_in += amount;
+		level_in -= amount;
+
+		return th;
+	}
+
+	return amount;
+}
+
+void vessel::display(std::ostream& o) const
+{
+	o << "Volume: " << volume << "\n";
+	o << "Level: " << level << "\n";
+	o << "Steam: " << steam << "\n";
+	o << "Pressure: " << get_pressure() << "\n";
+}
+
diff --git a/src/reactor/coolant/vessel.hpp b/src/reactor/coolant/vessel.hpp
new file mode 100644
index 0000000..dd0a321
--- /dev/null
+++ b/src/reactor/coolant/vessel.hpp
@@ -0,0 +1,40 @@
+
+#pragma once
+
+#include <ostream>
+
+namespace sim::reactor::coolant
+{
+
+class vessel
+{
+	double volume;
+	double level;
+	
+	double steam = 0;
+	double level_in = 0;
+	double steam_in = 0;
+
+	void display(std::ostream& o) const;
+
+public:
+
+	vessel(double level, double volume);
+
+	void update();
+	double add_steam(double amount);
+
+	constexpr double get_volume() const { return volume; }
+	constexpr double get_level() const { return level; }
+	constexpr double get_steam() const { return steam; }
+	constexpr double get_pressure() const { return steam / (volume - level); }
+
+	friend std::ostream& operator<<(std::ostream& o, const vessel& v)
+	{
+		v.display(o);
+		return o;
+	}
+};
+
+}
+
diff --git a/src/reactor/fuel/fuel_rod.cpp b/src/reactor/fuel/fuel_rod.cpp
index 3dd2bb3..1eaae81 100644
--- a/src/reactor/fuel/fuel_rod.cpp
+++ b/src/reactor/fuel/fuel_rod.cpp
@@ -12,7 +12,7 @@ void fuel_rod::display(std::ostream& o) const
 {
 	o << "Fuel: " << s.get_fuel() << " / " << s.get_mass() << "\n";
 	o << "Efficiency: " << s.get_efficiency() << "\n";
-	o << "Energy: " << s.get_energy() << "\n";
+	o << "Energy: +" << s.get_energy() << "\n";
 }
 
 double fuel_rod::get_k(val_t type) const
@@ -36,7 +36,7 @@ void fuel_rod::update(double secs)
 	
 	s.add_slow_neutrons(vals[val_t::N_SLOW]);
 
-	vals[val_t::HEAT] += s.extract_energy() / s.get_mass();
+	vals[val_t::HEAT] += s.extract_energy();
 	vals[val_t::N_FAST] += s.extract_fast_neutrons();
 	vals[val_t::N_SLOW] = 0;
 	
diff --git a/src/reactor/rod.hpp b/src/reactor/rod.hpp
index 9840a0e..c6aafa7 100644
--- a/src/reactor/rod.hpp
+++ b/src/reactor/rod.hpp
@@ -38,7 +38,7 @@ public:
 
 		o << r.get_name() << "\n";
 		r.display(o);
-//		o << "Heat: " << r.get(val_t::HEAT) << "\n";
+		o << "Heat: " << r.get(val_t::HEAT) << "\n";
 		o << "Fast: " << r.get(val_t::N_FAST) << "\n";
 		o << "Slow: " << r.get(val_t::N_SLOW) << "\n";