Winegrowers Supplies  -  Electrical warmers, to heat juice or wine

If juice or wine is too cold you may need to heat it. For example, to raise the temperature of juice above 10 C in order to enable fermentation to start, or with red wine to raise the temperature above 15 C so that a malo-lactic fermentation can start.

The manufacturers say that electric internal heaters (of any type) can only be used in wine or juice, not in Mash. Grape skins touching the heater-probe can lead to baking of the solids at the contact points, and can result in overheating of the electrical parts, causing them to burn out.

A thought: for heating Mash, it would be possible to use a sieve to protect the probe from contacting grape skins. Years ago I had a special red-wine fermenter/tank with a very large tunnel-sieve which pushed through the large square man-way-door and sat on the tank bottom; it sealed against the man-way-door. It was easy to pump the fermenting juice out for 'pumping over' or just prior to pressing. I had a Flap-valve in the man-way-door, which could have been used to insert the warmer.

an electric warmer that goes into a tank through a Flap-valve (Zapflochklappe):-


Model MG02: 1000 Watt, 230 Volt,  326

Model MG03: 2000 Watt, 230 Volt,  372

White plastic adaptor (with O-ring) so it can be pushed through a Flap-valve, 32

The stainless steel probe is about 600mm long and 36mm diameter, the cable is 2.7 metres long.
With MG02 the temperature increase is about 0.8 C per 1000 litres per hour; e.g. 3000 litres warms by 2 C in 8 hours. With MG03 it should be twice as fast.

The thermostat-controller can be set in the range from 5 to 35 C.

a 'warmer' for use through the top of tanks or other containers:-


 230 Volt with digital thermostat:-

 1000 W, 175
 2000 W, 197

The temperature can be set to between 5 and 35 C.
The warmer switches off if the liquid temperature exceeds the set temperature. If the liquid temperature is lower than the set temperature, the warmer switches on automatically and the red warning light comes on, signifying that the warmer is operating.

The whole stainless steel element (plus about 20cm of the cable) needs to be in contact with liquid, otherwise it will overheat and burn out.
Before removing the warmer from the tank, the equipment must be switched off (unplugged) and left for about 30 minutes to cool down.

If it has not been used for a long time, it should be checked to to see if the thermostat works. Check the temperature of the liquid with a thermometer. Check the temperature every hour until you are sure it is working correctly.

A new warmer is pre-set for the intended temperature 18 C with a difference of 1 C. To change this: setting the Digital Thermostat

Prices shown are exclusive of Vat.
Delivery usually will need to be charged at cost.