ACV COMFORT 100 Indirect Water Heater Tank-in-Tank

The ACV COMFORT 100 Indirect Water Heater Tank-in-Tank is a high-performance domestic hot water heating solution designed to deliver reliable hot water for residential applications. Utilizing advanced tank-in-tank technology, this indirect water heater ensures efficient heat transfer and rapid recovery times by immersing the domestic hot water tank entirely within the primary heating circuit. Built with durable materials, it integrates seamlessly into existing heating systems to provide a steady and dependable supply of domestic hot water.

Advantages

The tank-in-tank design maximizes heat transfer surface area, allowing the water heater to heat domestic water much faster than conventional single-wall cylinders. The continuous movement of primary water around the inner stainless steel tank helps prevent limescale accumulation, as the tank walls naturally flex during temperature changes. This robust construction ensures long-term operational reliability, reduces maintenance requirements, and delivers high hot water output relative to the unit's physical footprint.

Suitable for

• Residential homes requiring a reliable and efficient domestic hot water supply
• Integration with standard central heating boilers and heating systems
• Properties with simultaneous hot water demands across multiple fixtures
• New installations and modernization projects looking for improved energy efficiency

When it may not be suitable

This indirect water heater is not designed to operate as a standalone electric or gas water heater and requires a separate central heating boiler or heat source to function. It may not be suitable for properties lacking an existing hydronic heating system or space to accommodate a floor-standing or wall-mounted tank of this specific capacity.

Key specifications

• Tank-in-tank technology for rapid hot water recovery
• Indirect domestic water heating configuration
• Designed for residential heating systems
• Durable inner tank construction

How to use

Installation should be performed by a qualified heating technician in accordance with local plumbing and electrical regulations. The unit must be connected to a compatible central heating boiler, a cold water supply line, and the domestic hot water distribution network. Once properly integrated, the heating system warms the primary fluid surrounding the inner tank, which in turn heats the domestic water inside. Temperature settings and safety controls should be configured via the primary boiler and appropriate expansion relief valves during setup.

What to consider before purchase

• Verify compatibility with your existing central heating boiler or heat source
• Check available installation space and floor or wall load-bearing capacity
• Ensure domestic hot water demand matches the capacity of the unit
• Confirm local water quality and consider treatment if hardness levels are high

Usage recommendations: Regularly inspect safety valves, expansion vessels, and connections according to the manufacturer guidelines to maintain optimal performance and extend the operational lifespan of the heating system.