Cadac 20L Low Pressure Gas Water Heater – Runs Through Load Shedding

The Cadac 99400-01-20-LP is a 20-litre gas water heater that keeps hot water running through load shedding, powered entirely by LPG gas with a battery pulse ignition system that needs no mains electricity at all. It’s built for low-pressure starts from just 0.03MPa, which makes it a genuine option for gravity-fed tanks on farms and off-grid properties where most electric or high-pressure gas geysers simply won’t fire up.

If load shedding has ever left you standing under a cold shower, or you’re on a property with a gravity-fed tank that struggles to trigger a normal geyser, this unit solves both problems at once. It runs on two D-cell batteries for ignition, so there’s no dependency on the grid — hot water keeps flowing on stage 6 load shedding exactly as it would on a normal day. The dual control knobs let you adjust gas flow and water flow independently, so you can dial in the right temperature as the seasons change instead of living with one fixed setting.

The 40kW thermal output delivers up to 20 litres of hot water a minute — enough for a multi-bathroom household to run hot water simultaneously without the usual pre-heating wait. An ECO-burner configuration throttles gas use dynamically rather than running at a fixed rate, which keeps LPG consumption down (rated at up to 2.9kg/hour at full output). Safety is properly covered too: automatic flame-out protection, an anti-freeze sensor, and a dry-combustion cutout guard against gas leaks and overheating, which matters on an appliance that’s mounted and largely unsupervised.

It’s a strong fit for farms and smallholdings on gravity-fed water, bush lodges and off-grid cabins, and any household in a load-shedding-affected area that wants hot water security without a generator or inverter. You’ll need a 9kg LPG cylinder or larger to run it, and because it’s a natural-flue open-type unit, it needs to be installed in a properly ventilated space by a qualified gas installer. Order now and enjoy free delivery to your door anywhere in South Africa.

Key Specifications

• Low-pressure start-up (from 0.03MPa) — fires up on gravity-fed tanks and weak-pressure systems most gas geysers can’t handle
• Battery pulse ignition (2x D-cell) — 100% independent of mains electricity, works straight through load shedding
• 40kW thermal output, up to 20L/min — enough hot water for multiple bathrooms running at once
• ECO-burner gas throttling — dynamically manages gas use for lower running costs
• Dual gas/water control knobs — adjust temperature independently as seasons change
• Automatic flame-out, anti-freeze and dry-combustion protection — built-in safeguards against gas leaks and overheating
• Max gas consumption 2.9kg/hour — plan cylinder size around real usage
• Requires a 9kg LPG cylinder or larger — budget for bottle size when installing
• 12-month manufacturer warranty — backed by Cadac

Frequently Asked Questions

Does this gas water heater work during load shedding?

Yes — that’s the point of the design. It ignites using a battery-powered pulse system (two D-cell batteries) rather than mains electricity, so it fires up and heats water exactly the same whether the grid is up or you’re on stage 6 load shedding. As long as you’ve got LPG gas in the cylinder, hot water keeps flowing.

What does “low pressure” mean on a gas water heater, and do I need it?

Standard gas geysers usually need water pressure of around 0.15MPa or higher to trigger the burner — fine on mains-fed municipal water, but often too weak for a gravity-fed tank on a farm or smallholding. This model starts from just 0.03MPa, so it’s built specifically for weaker gravity-fed systems where a standard unit would fail to ignite at all.

Does Daily Discounts install gas water heaters, and is delivery included?

We deliver this unit nationwide, typically within 3 to 5 working days, but installation isn’t included — gas appliances like this need to be connected and ventilated correctly by a qualified gas installer, both for safety and to keep the warranty valid. Budget for installation separately when you order.