Isotemp Slim Marine Water Heater – 20L, 230V, 750W With Mixing Valve provides stored hot water for a boat’s onboard plumbing system. This Isotemp Slim 20 marine water heater combines a 20-litre tank, a 230V electric immersion heater and an engine water heat exchanger. It can heat water through the electric element or use heat transferred from the engine’s water circuit when installed as part of a suitable system. It is intended for boats and yachts that need hot water at connected faucets and other onboard outlets. The slim cylindrical design measures 645 mm long by 295 mm in diameter, including the mixing valve, so buyers can assess the space available before installation.

The inner tank, engine water coil, and connections are made from 316 stainless steel. A brushed 304 stainless steel outer cover and stainless steel mounting feet surround the tank, while polyurethane insulation helps retain heat. The supplied specification lists a weight of 10.5 kg and a maximum pressure of 7 bar. For buyers comparing a marine hot water tank with a household unit, these materials and the engine heat exchanger are central details: they describe a heater designed around marine installation and the ways hot water is produced aboard a vessel. The manufacturer states that the inner tank carries a five-year limited warranty against leakage caused by corrosion or a manufacturing defect; warranty terms should be checked with the supplied documentation.

Inside this boat water heater, the engine water heat exchanger and the 750W electric immersion heater sit low in the tank, where the stored water is coldest. Their placement is designed to heat the tank more evenly. The water inlet and outlet arrangement also helps limit the mixing of incoming cold water with stored hot water. The immersion heater is made from nickel-covered copper and is rated at 230V / 750W for this model. Buyers planning an installation should check that the vessel has the appropriate electrical supply, suitable plumbing connections, and enough room for the heater and its fittings. The specified water connections are ½-inch inside and outside NPT and BSP pipe threads; connection requirements should be confirmed against the vessel’s plumbing before ordering.

A temperature-controlled safety mixing valve is included with this Slim 20 model. Water heated by an engine heat exchanger can become very hot, and the electric element can also bring stored water above a comfortable outlet temperature. The adjustable valve mixes hot water from the tank with cooler water from the boat’s supply to set the temperature delivered at the faucet. This makes the valve an important part of the marine hot water heater’s everyday use and helps extend the usable volume of hot water from the 20-litre tank. If you are replacing an existing Isotemp water heater or selecting a boat hot water heater for a new installation, check the available mounting space, 230V supply, engine water circuit, and connection layout against this model’s specifications.

Key Features:

• Isotemp Slim Marine Water Heater – 20L, 230V, 750W With Mixing Valve provides a 20-litre hot water tank with electric heating and an engine water heat exchanger.
• The 230V, 750W immersion heater is positioned low in the tank to help heat the stored water evenly.
• The included temperature-controlled mixing valve blends hot and cold water to provide an adjustable outlet temperature.
• The inner tank, engine water coil, and connections are made from 316 stainless steel; the outer cover and mounting feet are made from 304 stainless steel.
• Polyurethane insulation helps reduce heat loss from the stored water.
• The heater measures 645 × 295 mm (length × diameter, including the mixing valve), weighs 10.5 kg, and has a specified maximum pressure of 7 bar.

Applications / Suitable For:

• Isotemp Slim Marine Water Heater – 20L, 230V, 750W With Mixing Valve suits boats and yachts fitted with an onboard hot water plumbing system.
• Suitable for installations that can use a 230V electric supply to heat stored water.
• Suitable for a compatible engine water circuit where the heat exchanger will be connected and used.
• Useful for replacing a marine water heater where its capacity, dimensions, pressure rating, and water connections match the existing installation.
• Suitable for marine plumbing layouts requiring a mixing valve to control the temperature of water delivered to connected faucets.

FAQs:

Q: How does the Isotemp Slim Marine Water Heater – 20L, 230V, 750W With Mixing Valve heat water?
A: It has a 230V, 750W electric immersion heater and an engine water heat exchanger. The heat exchanger requires a suitable connection to the boat’s engine water circuit.

Q: Is the mixing valve included?
A: Yes. This Slim 20 model includes a temperature-controlled mixing valve that blends hot tank water with cooler water before delivery to the faucet.

Q: What space is needed for the heater?
A: The stated dimensions are 645 mm long × 295 mm in diameter, including the mixing valve. Allow additional working space for mounting and connections when planning the installation.

Q: What material is the water tank made from?
A: The inner tank is made from 316 stainless steel. The engine water coil and connections use the same specified grade.