For many Redwood City homeowners, reliable hot water is more than just a convenience; it’s a daily necessity. From morning showers to dishwashing and laundry, hot water plays a critical role in everyday living. Traditional water heaters with large tanks have long been the standard, but instant hot water units, also known as tankless water heaters, are becoming increasingly popular.
If you’re considering upgrading, it’s important to weigh both the advantages and drawbacks before investing. In this blog, we’ll break down the pros and cons of upgrading to an instant hot water unit in Redwood City so you can make an informed decision for your household.
What Is an Instant Hot Water Unit?
An instant hot water unit heats water on demand rather than storing it in a large tank. When you turn on a tap, cold water flows through the unit, where powerful heating elements (electric or gas) instantly bring it up to the desired temperature. This technology eliminates the need for a bulky tank and reduces wasted energy from heating stored water.
Pros of Upgrading to an Instant Hot Water Unit
1. Endless Hot Water Supply
Unlike traditional tanks that can run out during back-to-back showers or laundry cycles, a tankless system delivers a continuous flow of hot water whenever you need it. For Redwood City families with multiple occupants, this benefit is a game-changer.
2. Energy Efficiency and Lower Bills
Tankless systems heat water only when required, avoiding the constant reheating that tanks demand. This on-demand design can reduce energy consumption by 20–40%, depending on household usage. Over time, these savings translate into noticeably lower utility bills.
3. Space-Saving Design
Traditional water heaters can be bulky, taking up precious space in garages, basements, or utility closets. Instant hot water units are compact and can even be wall-mounted, freeing up room for storage or other home needs.
4. Longer Lifespan
On average, tank-style water heaters last about 8–12 years. Tankless models, with proper maintenance, often last 15–20 years. This longevity means fewer replacements and less waste over time.
5. Eco-Friendly Choice
For eco-conscious Redwood City homeowners, a tankless unit reduces greenhouse gas emissions by using less energy and conserving water. Pairing one with renewable energy sources, like solar, can make your home even greener.
Cons of Upgrading to an Instant Hot Water Unit
1. Higher Upfront Cost
The biggest barrier for many homeowners is the initial investment. Tankless water heaters generally cost more to purchase and install than traditional tanks. However, the energy savings and longer lifespan often balance out the cost over time.

2. Installation Challenges
Switching from a traditional tank to a tankless system isn’t always straightforward. Some homes may require electrical upgrades, gas line modifications, or new venting systems, which can increase installation costs and time.
3. Limited Flow Rate
While tankless units provide endless hot water, they can struggle to handle multiple fixtures running simultaneously. For instance, running a shower, dishwasher, and washing machine all at once may stretch the system’s capacity. Choosing the right-sized unit is crucial.
4. Maintenance Requirements
To ensure longevity and efficiency, tankless water heaters need regular maintenance. This includes descaling to prevent mineral buildup, especially in areas with hard water, which is common in parts of California.
5. Learning Curve
Some households notice a slight delay in hot water delivery compared to tanks. While it’s minor, it may take a short adjustment period for families used to instant hot water from stored tanks.
Key Considerations for Redwood City Homeowners
Before upgrading, consider the following factors:
- Household size and water usage – Larger families may need a higher-capacity unit or even multiple systems.
- Energy source – Decide whether an electric or gas-powered system works best for your home.
- Budget – Factor in both upfront installation costs and long-term energy savings.
- Water hardness – Homes with hard water should budget for routine descaling maintenance.
Why Work with Professionals?
DIY installation of a tankless water heater is not recommended due to the complexity of gas lines, electrical systems, and venting requirements. Hiring licensed professionals ensures:
- Safe installation that meets local Redwood City building codes.
- Proper sizing of the system to fit your household’s needs.
- Warranty protection is required since most manufacturers require professional installation.
Final Thoughts
Upgrading to an instant hot water unit offers Redwood City homeowners many advantages: endless hot water, energy efficiency, and long-term savings. However, it’s essential to weigh these against the higher upfront costs, installation requirements, and maintenance needs.
When installed and maintained correctly, a tankless water heater can be a smart, eco-friendly upgrade that pays for itself in convenience and efficiency.
Call to Action
Thinking about upgrading to an instant hot water unit in Redwood City? Our team of professionals is here to help you choose the right system, handle installation with precision, and keep your unit running smoothly for years to come. Contact us today for a consultation and take the first step toward a more efficient, eco-friendly home.