Hemming Learning home

Simulators

The simulators

Each simulator covers one topic in short steps, with questions for the class along the way. You can try part of one on the home page.

Plumbing & Domestic Heating

  • A standard boiler and a condensing boiler side by side on a wall, with their flues running up through the roof

    Condensing vs Standard Efficiency

    Level 2 and 33D, with a 2D view Available

    Two gas boilers with their covers off, doing the same job. Follow the gas, air, flue gases and water, and see why condensing boilers use less gas.

    Try the demo of this simulator

  • A washbasin trap and branch pipe connected to a discharge stack, with a trap close-up

    Trap Seal Loss

    Level 2 and 33D, with a 2D view Available

    See the seven ways a trap can lose its water seal, and how each one is prevented.

  • A cut-away unvented hot water cylinder with its coil, expansion vessel, inlet controls, T&P relief valve, tundish and discharge pipe

    Unvented Hot Water Cylinder

    Level 2 and 33D, with a 2D view Available

    A 210 litre unvented cylinder, cut open. Heat it, run the tap, then break the safety devices one by one and see what the next level of protection does.

  • A boiler, pump, zone valves, cylinder and radiator on a wall, with the S Plan wiring diagram showing which wires are live

    S, Y and W Plan Controls

    Level 2 and 33D, with a 2D view Available

    The same boiler, cylinder and radiator controlled three ways. Switch the programmer and thermostats, follow the water and the live wires, and find the faults.

  • A house cut open from the front, with a cold water cistern in the loft, pipes down to a shower and two basins, a pressure gauge at each outlet and a yellow head measure

    Head and Static Pressure

    Level 23D, with a 2D view Available

    A house fed by gravity from a loft cistern. Raise the cistern, change the water level, the cistern and the pipes, and find out what really changes the pressure at each tap.

  • A boiler with a pressure gauge and relief valve, a red expansion vessel cut open, a filling loop and radiators on two floors

    Sealed System Pressure

    Level 2 and 33D, with a 2D view Available

    Charge the expansion vessel, fill through the filling loop and fire the boiler. Watch the gauge as the water expands, see what overfilling does, and diagnose a mystery fault.

  • A test rig: a cistern on a stand feeding a copper pipe run with elbows and three pressure gauges to a tap over a bucket, with a chart of pressure along the pipe

    Flow Rate and Pressure

    Level 2 and 33D, with a 2D view Available

    Change the pipe size, length, bends and supply. Watch the running pressure fall along the pipe, check the flow against the appliance and time a bucket filling.

  • A cut-away room in thermal colours, with heat arrows leaving through its walls and windows, a radiator under the window and a panel showing where the heat goes

    Room Heat Loss and Radiator Sizing

    Level 33D, with a 2D view Available

    Build a room from its walls, windows, floor and ceiling, see where the heat goes in a thermal view, then size a radiator and watch it grow at condensing boiler and heat pump temperatures.

  • An air source heat pump with its cover off: the fan and outdoor coil, the compressor and valves, and pipes through the house wall to underfloor heating and a hot water cylinder

    Heat Pump Refrigeration Cycle

    Level 33D, with a 2D view Available

    Follow the refrigerant round an air source heat pump. Change the weather and the flow temperature, watch the COP rise and fall, try weather compensation, heat the hot water cylinder, and defrost a frozen coil.

  • A circuit diagram: a battery, a switch and an ammeter with two glowing bulbs on parallel branches, and a meter listing each one's voltage and current

    Resistance and Current Lab

    Level 2 and 32D Available

    Build series and parallel circuits with bulbs, resistors, an NTC thermistor, an LDR and a solar cell. Heat it, dim it and watch the current change.

Electrical Installation

  • A kitchen wall with a split-load consumer unit and its circuit chart, a double socket with its faceplate eased forward, and a voltage indicator and proving unit on the worktop

    Safe Isolation

    Level 2 and 33D, with a 2D view In development

    Make a circuit dead, keep it dead and prove it dead before you work on it. Then see the wrong label, faulty tester and unlocked breaker that the procedure is there to catch.

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We can show you every simulator, with presenter mode and the built-in questions.

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