500L Domestic Hot Water Tank: The Ultimate Specification & Installation Guide

 Project Case: 500L Domestic Hot Water Tank for European Villa Ground Source Heat Pump System

 Project Overview

Location: Rural villa, Central Europe

Building Type:Single-family luxury villa, 450 m²

System Type: Ground source heat pump (GSHP) + 500L domestic hot water storage tank

Core Demand: Replace old oil boiler system, supply 24h stable sanitary domestic hot water and space heating, cut carbon emission and reduce running cost.

The villa owner abandoned traditional oil-fired heating system and upgraded to geothermal ground source heat pump solution. The 500L domestic hot water tank was selected as DHW storage cylinder to cooperate with the GSHP unit. It solves the problem of instantaneous peak hot water demand for multiple bathrooms and kitchen hot water usage.

 System Configuration

1. Ground source heat pump unit (matched with BITZER scroll compressor)

2. 500L Domestic Hot Water Tank (DHW Cylinder)

   - Inner tank: Enamel / AISI316L stainless steel optional

   - Insulation: 50~80mm high density PU foam, low standing heat loss

   - Working pressure: 10 bar

   - Built-in magnesium anode rod for anti-corrosion protection

   - Multiple ports for heat pump connection, temperature sensor and safety valve

3. Underfloor heating circuit & circulation pump

4. Control module for temperature automatic adjustment

 Key Benefits of 500L DHW Tank in This Project

1. Stable Hot Water Supply

The 500L storage capacity can handle peak hot water demand of 5–7 family members at the same time, avoiding temperature fluctuation when multiple taps open simultaneously.

2. Protect Heat Pump & Reduce Cycling

The hot water tank stores thermal energy. It prevents the ground source heat pump from frequent start & stop under intermittent hot water demand, extends compressor service life and improves seasonal COP.

3. Low Heat Loss & Energy Saving

Thick polyurethane foam insulation minimizes standby heat loss. The tank keeps hot water temperature for a long time, reduces the heat pump startup frequency and lowers electrcity consumption.

4. Safe & Durable for Potable Water

Compliant with EU drinking water standard. Enamel inner tank + magnesium anode anti-corrosion structure, long service life for continuous sanitary hot water operation.

Project Result

After 12 months of operation:

- 72% reduction of carbon emission compared with old oil boiler

- Stable 24h domestic hot water supply for the whole villa

- Heat pump works in a much smoother operating condition, less start-stop cycles

- Annual energy cost for heating & hot water decreased by 65%

 Application Recommendation

This 500L domestic hot water tank is widely compatible with ground source heat pump, air source heat pump and solar thermal systems. Suitable for large villas, small guesthouses, apartment suites and light commercial hot water projects.