Three phase water heater options

Our three phase water heater range of instantaneous water heaters are the perfect solution for instantaneous water heating with a three phase electric supply. We also do a 3 phase water heater with stored hot water options for applications where an instantaneous water heater can’t handle a peak domestic hot water demand and thus an element of stored water is required.

Our 3 phase electric water heater range, which are available as a 3 phase instantaneous water heater / 3 phase tankless water heater or a storage 3 phase hot water system can cover all your domestic hot water heating requirements.

Efficient hot water supply is crucial for commercial and industrial applications. Instantaneous water heating is the most energy-efficient way of producing hot water electrically. Three phase water heater’s offer a reliable and efficient solution for domestic hot water supply.

Three phase power

An electrical system’s phase determines the distribution of a load. What’s the distinction between single-phase and three-phase power supplies? A single-phase power circuit features two wires carrying alternating current (AC).

Typically, there is one power wire, known as the phase wire, and one neutral wire, with current flowing between the two. Three-phase power is a three-wire alternating current power circuit in which each phase AC signal is 120 electrical degrees apart.

Businesses and factories typically use a three-phase power supply, while residential homes typically use a single-phase power supply.

One significant distinction between single-phase and three-phase power sources is that a three-phase power supply can handle larger loads and power ratings that are required for three phase hot water systems and the flow rate that is required.

Instantaneous water heater: hot water on demand

3 phase instantaneous water heaters are a great option for lower hot water demands. We have a full range of instantaneous water heater products that benefit from bare wire water heating technology (heating elements) for maximum energy efficiency and accurate hot water outlet temperature from the appliance for one or more outlets / multiple draw off points, depending on the flow rate required.

Instant 3 phase hot water heater range – Flexiheat UK

These units are sometimes referred to as three-phase tankless water heaters, 3 phase instant water heaters, or a 3 phase electric instantaneous water heater.

The two smallest instantaneous water heaters – can be set to various outputs i.e. our 9kW to 15kW water heater can be set to either 9,11,12, or 15 kW to suit you water heating requirements.

This range of three phase water heaters can cope with pre heated water up to 45°C, thus can be used to heat up pre heated hot water from solar systems or other heat sources to a maximum outlet temperature of 60 °C.

The hot water temperature rise is known as the Delta T and is shown as “Δt” in the below data chart – this is the amount of hot water temperature increase applied to the incoming water into these three phase water heaters.

Generally, the lowest cold water mains temperature for most of the UK is 10°C (the Scottish Highlands / Lowlands it can be 5°C as the further north you go, the colder the mains water will be in winter).

You shower and bath at 40°C, so in the winter period, when you require warm domestic hot water the most, you are generally lifting the water temperature by 30°C for daily use, thus the Delta T of 30°C in the below 3 phase instant water heater performance details.

Please note that the maximum water temperature this 3 phase instantaneous water heater range can produce is 60 °C. If your require higher water temperatures, then you need to look at our storage water heater option.

Larger 3 phase electrical instantaneous water heater?

When more water is needed than a single electrical three phase water heater  can supply, multiple three phase electrical instantaneous water heaters can be connected in parallel together.

If you require a higher flow rate, then you can use these instantaneous three phase water heaters piped up in a parallel configuration, which increases the system’s heating capacity, ensuring a higher flow rate and lower pressure drop through the water heaters.

But there are some conditions that you need to be aware of –

1. All of the instantaneous water heater used must be the same kW output, you cannot mix and match outputs
2. As long as all heaters receive an adequate flow rates (2.5 litres per minute flow rate is minimum per water heater – so if it’s three units then the minmum flow rate to activate the parallel water heating system would be 3 x 2.5 Litres = 7.5 Litres minimum flow rate ), this is the ONLY technique that is advised. These 3 phase electric instantaneous water heaters should not be plumbed in series.
3. They should be installed in a reverse return piping arrangement – This way regardless of demand, the flow through each instantaneous three phase water heater should be the same in the setup, and each heater will operate for roughly the same amount of time.

We stock these instantaneous water heaters and if order early in the day they can be sent on a next working day delivery service or even for a Saturday delivery at extra cost.

we stock these units on the shelf and are available on a next day delivery times.

We go into full depth on this dedicated webpage about our electric instantaneous water heaters, which are all 3 phase powered. Here – Electric instantaneous water heaters

Storage three-phase hot water systems

Sometimes you’re going to need a storage water heater rather than an instantaneous water heater, as your water heating requirements or peak load are just too large for an instantaneous water heater to be able to cope with and a stored water volume is the only solution.

We offer a comprehensive selection of 3-phase-powered storage water heaters in duplex stainless steel (which has the best corrosion resistance), ranging in capacity from 80 litres to 1,380 litres, compatible with various stainless steel immersion heaters up to 108 kW in power.These immersion heater / heaters come with a temperature regualtion thermostat and saftey thermostat.

Commercial & Industrial electric water heaters from Flexiheat UK

We offer a glass-lined or 316 stainless steel 3 phase water heater with a storage tank capacity ranging from 80 to 6,000 litres, equipped with immersion heaters capable of producing up to 400 kW of heating power so you can supply multiple draw off points. This water heater range can produce water with a maximum temperature of 80 °C, which is more than our electric instantaneous water heater range, which is 60 °C.The immersion heater range we use are top quality and manufactured with a Incoloy heating element for the immersion heater, which require a three phase electrical supply.

We go into more depth on our 3 phase electrical powered storage water heater range here – 3 Phase storage water heater range

Contact us

Should you require further assistance or information on our three phase water heaters, then please contact our sales team on 01202 822221 or click here for our email contact form.