Expert installation, repair, and replacement for DHT water heaters across Suffolk and Nassau County, backed by 24/7 emergency service.
Domino Fuel installs, repairs, and replaces DHT water heaters across Long Island. Our licensed plumbers service every DHT model, size it right for your home, and back every job with a free estimate and 24/7 emergency service.
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DHT is one of the water heater brands we proudly install and service across Long Island. Our licensed plumbers know DHT systems inside and out, from quick repairs to full replacements and upgrades.
Browse all the water heater brands we carry, or see the rest of our plumbing services.
Diversified Heat Transfer (DHT) builds Techtanium indirect water heaters that use your boiler to heat domestic hot water, for high efficiency and low operating cost. Glass-lined models come in top-connection (MP) and side-connection (TT) configurations.
DHT water heater highlights:
Here is roughly what a new water heater costs to install, using current national averages. DHT builds indirect tanks heated by your boiler, so installed cost is similar to a storage tank plus the boiler tie-in.
| Water heater type | Typical installed cost (U.S. average) |
|---|---|
| Tank water heater (installed) | $882 - $1,817 |
| Tankless water heater (installed) | $1,405 - $3,899 |
Per HomeAdvisor and Angi (2026): tank water heaters average about $1,340 (roughly $600 to $2,500 by size), and tankless units average about $2,637. Gas line, venting, electrical, and old-unit removal affect the final price.
Want your exact number? Costs vary by model and your setup, so we never guess. Get a free estimate for your exact DHT water heater price, with no obligation.
Here is a quick look at the main DHT water heater models we install and service on Long Island, so you can compare type, fuel, and capacity at a glance.
| Model / Series | Type | Fuel | Efficiency / Capacity | Best For |
|---|---|---|---|---|
| Techtanium MP (20-50) | Indirect, top connections | Heated by your boiler | 20-50 gal, glass-lined | Compact installs with a boiler |
| Techtanium TT (40-79) | Indirect, side connections | Heated by your boiler | 40-79 gal, glass-lined | Most homes with a boiler |
| Techtanium TT-119 | Indirect (boiler-fired) | Heated by your boiler | 119 gal | Large or light-commercial demand |
Indirect water heaters are heated by your home's boiler. See our indirect water heater brands for more options.
Every DHT water heater we install is sized for your home, with the right size to match your boiler and demand, and set up to code with a temperature-and-pressure relief valve, expansion tank where required, proper venting, and a clean fuel or electrical connection.
We pull permits, haul away the old unit, and make sure you have safe, reliable hot water before we leave. See our full water heater installation guide or browse all water heater brands.
No hot water, leaks, strange noises, or discolored water? Our licensed technicians diagnose and repair DHT water heaters fast, with 24/7 emergency service across Suffolk and Nassau County. We carry common parts so most repairs are done in one visit.
Routine maintenance, flushing sediment or descaling, checking the anode rod, and testing the relief valve, keeps your water heater efficient and extends its life. See our water heater repair page.
When a water heater is leaking from the tank, rusting, or beyond economical repair, we make replacement simple. We will tell you honestly whether to repair or replace, and help you decide between a standard tank, a high-efficiency or heat-pump model, or going tankless for endless hot water.
We handle removal and disposal, any venting, gas, or electrical changes, and available rebates, all with a free estimate up front. See our water heater replacement page, or compare tankless options.
Catching these early usually means a smaller, cheaper fix. Call us if your DHT water heater shows any of the following:
Repair is not always the smart money. It is usually time to replace your water heater when you see:
We stock or quickly source the parts that wear out most on DHT water heaters, so repairs and tune-ups stay fast:
Not sure what your water heater needs? Contact us or call (631) 779-3196 and we will diagnose it for you.
Because this is an indirect tank, it works with your boiler. See our indirect water heater brands and boiler brands.
Not sure which brand fits your home? Explore the other water heater brands we install and service across Long Island.
Common questions about this water heater brand on Long Island.
Yes. Our licensed technicians repair all DHT water heaters across Suffolk and Nassau County, including 24/7 emergency service.
Yes. We install and replace DHT water heaters, sized for your household and installed to code, with a free estimate up front.
A storage tank typically lasts 8 to 12 years and a tankless unit about 20 years with maintenance. We will give you an honest repair-or-replace recommendation and a free estimate.
It depends on your hot-water demand, space, and budget. Tankless costs more up front but saves energy and never runs out; we will help you choose and give you a free estimate.
Yes. We install and service both tank and tankless models where the manufacturer offers them, and we will help you choose the right type and size for your home.
It depends on the type, size, and your home's setup, so we give you a clear quote before any work. The estimate is free and there is no obligation.
Get a free, no-obligation quote from your local Long Island water heater experts.
