Hours of work: 35 hours, 9am-5pm Mon – Fri with 1-hour unpaid lunch
Location: West Molesey, Surrey (near London).
Salary: Depending on experience + Benefits + Training & Qualifications
Diffusion, part of Volution Ventilation UK, is a leading British manufacturer with over 60 years of expertise in designing and manufacturing fan coil units for commercial and residential developments across the UK. Our products provide heating and cooling solutions for commercial offices, hotels, hospitals, schools, airports, and high-profile residential projects.
Job Profile:
This is an excellent opportunity for someone with an interest in Mechanical or Building Services Engineering, Construction, Manufacturing, or Technical Sales to build a long-term career within a specialist HVAC sector.
You’ll receive comprehensive training from experienced engineers who want to see you succeed, funding support towards industry-recognized qualifications (HNC/HND/Degree depending on your level), and the opportunity to develop valuable technical, commercial, and project management skills.
Working alongside experienced colleagues, you’ll support the external sales team by analysing consultant specifications, selecting products, preparing quotations, and helping customers find the most energy-efficient and cost-effective HVAC solutions.
Whether you’re a school or colleague leaver, university graduate, or simply looking for a career change, we’ll give you the tools, training, and confidence to build a long-term career in engineering, with career progression opportunities in External Sales, Technical Support Engineering & Design, Project Engineering & Management.
As a Trainee Internal Sales Engineer, your responsibilities will include:
• Providing technical support and product selections for consultants, contractors, and customers.
• Producing detailed fan coil schedules and quotations in line with project specifications.
• Ensuring product selections meet heating, cooling, acoustic, and energy efficiency requirements.
• Managing multiple projects and enquiries at different stages of the sales cycle.
• Building strong relationships with Architects, Consultants, Contractors, and End Users.
• Responding to customer enquiries via phone and email.
• Identifying missing tender information and following up on project opportunities.
• Developing knowledge of HVAC products, industry standards, and market trends.
• Working closely with sales, production, and other internal departments to ensure successful project delivery.
We’re looking for someone who is technically minded, organised, and eager to learn:
Ideally, you will have:
• A genuine interest in Mechanical or Building Services Engineering, or a related discipline, or work experience.
• A qualification in Science, Mathematics, Mechanical Engineering, Building Services, or a related discipline
• A background in technical, engineering, construction, manufacturing, or sales support
• Strong analytical and problem-solving skills.
• Excellent attention to detail.
• Good communication and relationship-building skills.
• Proficiency in Microsoft Office, particularly Excel.
• The ability to manage multiple priorities and work effectively within a team.
• A willingness to learn new systems, products, and technical concepts.
• A reasonable commuting distance to West Molesey.
Package on offer:
- Salary dependent on experience
- Annual salary review August each year
- 21 days rising to 26 days depending on length of service.
- Pension – auto-enrolled after 3 months service
- Health Assured – Employee Assistance Program
- Employee Referral scheme – up to £500
- Quarterly Volution Values Awards – win £100
- Excellent training and development opportunities.
If you’re looking to start or develop a career in engineering and technical sales with a well-established UK manufacturer, we’d love to hear from you. You can learn more about us here; https://www.diffusion-group.com/about-us
…