Buyer's guide
Every distributor asks this before switching their range, and every end customer asks it before buying. Below is the comparison we send to buyers, the running-cost arithmetic behind it, and the cases where a storage tank is still the right answer. Read it in three minutes, forward it to your own customers.
| Point | TanklessInstant · our range | StorageTank unit |
|---|---|---|
| Heating method | Heats water instantly as it flows through. No tank, nothing to pre-heat. | Pre-heats water and keeps it stored in a tank until the tap opens. |
| Hot water supply | Unlimited hot water on demand. | Limited to tank capacity (30 L, 50 L…). Once empty, you wait for it to reheat. |
| Energy efficiency | Draws power only while water is running. No standby heat loss. | Reheats continuously to hold its temperature, so it loses energy around the clock. |
| Size & space | Compact and wall-mounted. Fits a small bathroom or an under-sink cabinet. | Bulky tank that needs dedicated floor or wall space. |
| Installation | Vertical, horizontal or concealed — orientation is up to the fitter. | Fixed orientation, more pipework and more planning. |
| Time to hot water | 2–3 seconds. | Wait for preheated water to travel through the pipe to the tap. |
| Maintenance | No tank to clean, so upkeep stays low for the whole life of the unit. | Periodic descaling and tank cleaning. Tanks rust and leak over time. |
| Lifespan | 10–15 years. | 8–12 years. |
| Best for | Bathrooms, kitchens, heating systems, modern homes and hotels. | Older installations and whole-house central heating with lower demand. |
| Cost | Higher purchase price, lower running cost. | Lower purchase price, higher electricity bills. |
Running-cost math
The saving is real but it depends on your market, so do not take a number from a brochure — put your own into the box. Both columns heat the same amount of water to the same temperature; the only difference is that a storage tank reheats to hold its temperature when nobody is using it.
Indicative arithmetic only: energy = litres × temperature rise × 0.001163 kWh, plus the standby percentage you entered. It excludes pipe losses, tariffs with time-of-use bands and any hot-water demand the tank covers overnight. Use it as a starting point, not as a quotation.
Straight answer
We sell instant heaters, so treat this as the honest list of cases where we tell a buyer to keep their tank. If any of these describe your market, specify storage instead.
An instant heater needs its own circuit, typically 4.5 kW and up. Where old buildings only offer 2–3 kW per dwelling and rewiring is off the table, a storage tank spread over a long heating window is the practical answer.
Check the breaker firstTwo showers plus a kitchen sink running simultaneously was the design case for the storage tank. Instant units serve one or two points at a time, so whole-house supply means one heater per outlet or a central unit on three-phase.
Plan per outletA tank buffers both. Where the grid dips several times a day, electronics-heavy instant heaters are exposed to the surges and a tank keeps hot water available through short cuts.
Market dependentTemperature rise is capped by element power. With a 5 °C winter inlet, an 8.5 kW unit can only deliver a limited flow at 45 °C. Where the winter is long and severe, check the flow rate you need before committing.
Size on winter inletModel guide
Four platforms cover the range. All of them use cast aluminium heating elements, run hot water in about two seconds and are CE & RoHS compliant.
| Installation | Recommended | Why |
|---|---|---|
| Family bathroom shower | LZT-1 · 8,500 W | Full-power element for a shower, 240 × 55 × 360 mm wall unit, stepless 30–55 °C with one-touch summer and winter modes. |
| Wide wall, low ceiling space | LZT-2 · 8,500 W | Same power in a wide, low body (360 × 55 × 240 mm) — the shape that fits under a window or above a door frame. |
| Small guest bathroom, caravan, site cabin | LZT-3 · 7,000 W | Compact 190 × 55 × 260 mm and only 2.4 kg, and it mounts in any orientation — so it works where there is no room for anything else. |
| Kitchen sink, under-sink cabinet, washbasin | LZT-4 · 6,000 W | Under-sink format with constant-temperature control. Also used as a shower unit where the supply is limited to 6 kW. |
| Hot water at a basin with no heater | Instant hot-water taps | Heater built into the tap body — no separate unit, no extra pipework. Range in preparation. |
| Bathroom heating, not water | Panel & ceiling heaters | Same customer, different job: wall panel and ceiling bathroom heaters for the room itself. Range in preparation. |
Buyer questions
Most household instant heaters need 4.5 to 8.5 kW on their own circuit, because the element has to raise the water temperature in the two or three seconds it passes through the unit. A 3 kW supply will only serve a small point-of-use unit at low flow, so check the existing circuit breaker and cable size before specifying. Where the supply is limited, keep the heater on a dedicated circuit and size the element to the available power.
A single instant heater is sized for one or two draw-off points at a time, typically a shower, a basin or a kitchen sink. Whole-house supply with several bathrooms running together needs either a larger central tankless unit on a three-phase supply or one point-of-use heater per outlet, which is the more common approach in Europe and Asia.
Yes. The element has a fixed power, so the temperature rise it can deliver depends on how cold the incoming water is. In winter, when mains water can drop to 5 °C, the achievable flow rate at 45 °C is lower than in summer. Unit selection should always be based on the winter inlet temperature of the destination market, not on the summer figure.
Only if the mains pressure at the outlet is below the unit's minimum working pressure. Instant heaters are sensitive to low pressure and low flow, because their safety cut-outs switch the element off when flow drops. Where pressure is unreliable, a small booster pump or a constant-pressure installation keeps the heater working as intended.
Our instant water heaters and taps are CE and RoHS certified for the European market. The bathroom heater range holds CCC (China) certification and export certification can be arranged with your order. Every unit is tested before shipment, and we supply the corresponding test documentation with the order. Certification for other markets can be discussed at the quotation stage.
Units are built to the mains standard of the destination market, typically 220–240 V with the plug type of your choice, and 110 V versions are available on selected models. Tell us the destination country when you request a quotation and we will match the plug, cable and rated voltage to it.
Yes. OEM and ODM are our normal way of working. We can brand the unit, the glass panel colour, the gift box, the carton and the user manual, and we can adjust the specification for your market. Panel colours currently offered are black, white, grey and blue.
Samples start at 1 piece and a normal order starts at 10 sets per model. For a custom-branded order, your panel colour, pattern and logo apply from 100 pieces, and printed retail packaging from 1,000 pieces; the plug standard and cable length add no extra minimum. Mixed-model orders can be discussed.
Send us the destination country and the outlets you need to cover. We will tell you which units fit the local supply, what the certification position is, and what a container of mixed models costs.
