Frequently asked questions

Yes, Hamworthy Heating offer a wide range of water heaters, plus calorifiers and storage tanks. The range includes the Dorchester DR-SG condensing water heater, Dorchester DR-FC Evo condensing water heater, DR-CC condensing water heater, Halstock calorifier, Halstock storage tank, Powerstock hot water storage tank and Powerstock calorifier. For more information on the individual ranges visit HERE.

Yes, Hamworthy Heating sell two ranges using natural refrigerants, both developed to satisfy changing market needs and offering a competitive performance with an ultra-low GWP. Featuring R290 natural refrigerant, the Tyneham 290HT range is available in 3 chassis sizes and five outputs: 15kW, 18kW, 27kW, 40kW and 50kW. The Tyneham CO2 and CO2Q low noise commercial heat pumps use R744 natural refrigerant and come in three chassis sizes and outputs: 65kW, 95kW and 130kW. For more information on Natural Refrigerant Commercial Heat Pumps visit HERE.

No, Hamworthy Heating delivers heating and domestic hot water solutions that are at the forefront of technology and developed in line with the latest market trends and legislation.

Armed with everything from market-leading commercial condensing boilers, monobloc air source heat pumps, hot water heaters and heating systems equipment, they provide a range of solutions to help UK commercial buildings on their journey to Net Zero.

Stratton mk3 boilers feature a 5:1 turndown ratio, excellent low-class 6 NOx emissions across all models, and up to 97% gross seasonal efficiency. Featuring a durable stainless steel heat exchanger for longevity, all Stratton mk3 boilers offer exceptional system tolerance and are backed by a five-year heat exchanger warranty. Find out more about the Stratton mk3 wall-mounted commercial boiler HERE.

To help support the installation of Stratton mk3 wall-hung condensing boilers onto existing heating systems, the Hamworthy range also includes a selection of Plate Heat Exchangers (PHEX) to provide increased boiler protection and performance. Find out more about Plate Heat Exchangers HERE.

Hamworthy Heating commercial boilers, heat pumps and water heaters come with a 24-month warranty from the date of despatch as standard. If we commission your new products, the warranty will also include the labour part of any warranty work.

If you order commissioning at the same time as your boilers or hot water products, we’ll extend the warranty period up to 30 months from the date of dispatch at no extra cost.

If we commission your Tyneham R32 or R290 heat pumps, the warranty will be extended to five years.

Different metals have different properties, such as weight, corrosion resistance and heat conductivity which also have an impact on the heat exchanger design, for example, the size of the waterways. While one heat exchanger type can be suitable for one building, it might be unsuitable for another.

At Hamworthy Heating, our engineers use the most up to date version of sizing standards from official bodies to size hot water systems. These include:

• CIBSE Guide G:2014 Public Health Engineering

• IOP Plumbing Services Design Guide

• British Standards BS 8558:2015

Yes, Hamworthy Heating can provide unvented kits for the full range of water heater products – calorifiers and direct fired water heaters. The kit contents and specification of individual components can be different depending on the product range, but generally include:

• Strainer

• Pressure control valve

• Balanced cold supply connection

• Non-return valve

• Expansion relief valve

• Expansion vessel connection

• Expansion vessel appropriately sized

• Temperature pressure relief valve

• Tundish

For more information on unvented kits, refer to the product brochures HERE.

Yes, the Tyneham 290HT range of commercial heat pumps can achieve water flow temperatures of up to 75 degrees Celsius. To find out more visit HERE.

Stainless steel is an alloy of iron combined with chromium (min. of 10.5%) to make it corrosion resistant and lower carbon content compared to cast iron. Grade 316 is the most common type, with good welding and heat transfer properties, similar to those of cast iron. Compared to aluminium, stainless steel is tolerant towards a wider pH band (7-9.5), making it suitable for more challenging water conditions. Wetter environments such as swimming pools can especially benefit from these properties. Given its durability and longevity, warranty terms are often favourable (5-10 years); for instance, ModuMax Mk3 comes with a 10-year warranty.

An unvented hot water system has no cold water feed tank but rather has a sealed (unvented) hot water cylinder fed directly from the cold water mains and uses mains pressure. The unvented cylinder maintains a steady pressure from an incoming water supply. Unvented systems are ‘sealed/closed’ systems and so require additional ancillary equipment, such as an expansion vessel to manage the changes in pressure within the system as the water within heats up, and a pressure reducing valve to regulate the pressure of the incoming cold water.

Expansion vessels are essential in any pressurised heating system and are likely to be present in an unvented hot water system. Without an appropriately sized expansion vessel the components of a closed water system are at risk of becoming damaged by changes in pressure. Expansion vessels - also known as hydraulic accumulators or expansion tanks – are usually located in or near the boiler/water heater but this will depend on system design. Expansion vessels can be sized either for the individual product or sized for the total amount of expansion volume required, if there are multiple hot water products installed together.